EN 10216-1 non alloy steel tubes

Table 2 — Chemical composition (cast analysis) a in % by mass for quality TR2

a Elements not included in this Table shall not be intentionally added to the steel without the agreement of the purchaser, except for elements which may be added for finishing the cast. All appropriate measures shall be taken to prevent the addition of undesirable elements from scrap or other materials used in the steelmaking process.

b The content of these elements need not be reported unless intentionally added to the cast.

c Option 2: In order to facilitate subsequent forming operation, an agreed maximum copper content lower than indicated and an agreed specified maximum tin content shall apply.

d This requirement is not applicable provided the steel contains a sufficient amount of other nitrogen binding elements which shall be reported.

Table 3 —Chemical composition (cast analysis) a in % by mass for quality TR1

a Elements not included in this table shall not be intentionally added to the steel without the agreement of the purchaser, except for elements which may be added for finishing the cast. All appropriate measures shall be taken to prevent the addition of undesirable elements from scrap or other materials used in the steelmaking process.
b The content of these elements need not be reported unless intentionally added to the cast.
c Option 2:In order to facilitate subsequent forming operation, an agreed maximum copper content lower than indicated and an agreed specified maximum tin content shall apply.
d These grades do not support the Essential Requirements of the New Approach Directive 97/23/EC.

8.2.2 Product analysis
Option 3: A product analysis for tubes of quality TR2 shall be supplied. For tubes with outside diameter less than or equal to 76, 1 mm this option applies only in combination with Option 11.
Table 4 specifies the permissible deviations of the product analysis from the specified limits on cast analysis given in Table 2 and Table 3.

Table 4 —Permissible deviations of the product analysis from specified limits on cast analysis given in Tables 2 and 3

8.3 Mechanical properties

8.3.1 Mechanical properties for quality TR2
The mechanical properties of the tubes shall conform to the requirements of Table 5 for grade TR2 irrespective of whether they are verified or not (see Table 11).

Table 5 — Mechanical properties for quality TR2 a

a For wall thickness greater than 60 mm the mechanical properties are subject to agreement.
b See 11.2.
c l = longitudinal t = transverse
d Option 4: In addition to the test in Table 11, longitudinal impact strength shall be verified at - 10 °C.
*1 MPa = 1 N/mm 2

8.3.2 Mechanical properties for quality TR1
The mechanical properties of the tubes shall conform to the requirements of Table 6 for grade TR1 irrespective of whether they are verified or not (see Table 10).

Table 6 — Mechanical properties for quality TR1 a

a For wall thickness greater than 60 mm the mechanical properties are subject to agreement.
b See 11.2.
c l = longitudinal t = transverse
d These grades do not support the Essential Requirements of the New Approach Directive 97/23/EC.
* 1 MPa = 1 N/mm

8.4 Appearance and internal soundness
8.4.1 Appearance
8.4.1.1 The tubes shall be free from external and internal surface defects that can be detected by visual examination.
8.4.1.2 The internal and external surface finish of the tubes shall be typical of the manufacturing process and,where applicable, the heat treatment employed. Normally the finish and surface condition shall be such that any surface imperfections requiring dressing can be identified.
8.4.1.3 It shall be permissible to dress, only by grinding or machining, surface imperfections provided that,after doing so, the wall thickness in the dressed area is not less than the specified minimum wall thickness. All dressed areas shall blend smoothly into the contour of the tube.
8.4.1.4 Surface imperfections which encroach on the specified minimum wall thickness shall be considered defects and tubes containing these shall be deemed not to conform to this Part of this EN 10216.
8.4.2 Internal soundness
8.4.2.1 Leak-tightness
The tubes shall pass a hydrostatic test (see 11.4.1) or electromagnetic test (see 11.4.2) for leak-tightness.Unless the Option 5 is specified the choice of the test method is at the discretion of the manufacturer.
Option 5: The test method for verification of leak-tightness in accordance with 11.4.1 or 11.4.2 is specified by the purchaser.
8.4.2.2 Non-Destructive Testing
Option 6: The tubes of quality TR2 shall pass a non-destructive test for the detection of longitudinal imperfections in accordance with 11.7. The test method shall be specified by the purchaser

8.5 Straightness
The deviation from straightness, of any tube length L shall not exceed 0,001 5 L. Deviations from straightness over any one metre length shall not exceed 3 mm.
8.6 Preparation of ends
Tubes with wall thickness ≥ 3,2 mm shall be delivered with square cut ends. The ends shall be free from excessive burrs.
Option 7: The tubes with wall thickness ≥ 3.2 mm shall be delivered with bevelled ends (see Figure 1). The bevel shall have an angle α of 30°( +°5,-0°)with a root face C of 1,6 mm ± 0,8 mm, except that for wall thickness T greater than 20 mm, an agreed alternative bevel may be specified.

Key
D outside diameter
α bevel angle
C root face of bevelled end

Figure 1 — Tube end beve

8.7 Dimensions, masses and tolerances
8.7.1 Diameter and wall thickness
Tubes shall be delivered by outside diameter D and wall thickness T.
Preferred outside diameters D and wall thicknesses T have been selected from EN 10220 and are given in Table 7.
Dimensions which are different from those in Table 7 may be agreed.
8.7.2 Mass
For the mass per unit length the provisions of EN 10220 apply.
8.7.3 Lengths
Unless Option 8 is specified the tubes are delivered in random lengths. The delivery range shall be agreed at the time of enquiry and order.
Option 8: The tubes shall be delivered in exact lengths and the length shall be specified at the time of enquiry and order. For the tolerances, see 8.7.4.2.l

Table 7 — Preferred dimensions

Dimensions in millimetres

8.7.4 Tolerances
8.7.4.1 Tolerances on diameter and thickness
The diameter and the wall thickness of the tubes shall be within the tolerance limits given in Table 8.
Out-of-roundness is included in the tolerances on outside diameter and eccentricity is included in the tolerances on wall thickness.

Table 8 — Tolerances on outside diameter and on wall thickness

a For outside diameters D ≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5 % of the wall thickness T

8.7.4.2 Tolerances on exact lengths
The tolerances for exact lengths shall be as given in Table 9.

Table 9 — Tolerances on exact lengths

Dimensions in millimetres

9 Inspection

9.1 Types of inspection
Conformity to the requirements of the order, for tubes in accordance with this Part of EN 10216, shall be verified by:
 non-specific or specific inspection for quality TR1;
 specific inspection for quality TR2.
When an inspection certificate 3.1 is specified, the material manufacturer shall state in the confirmation of the order whether he is operating according to a “quality-assurance system”, certified by a competent Body established within the Community, and having undergone a specific assessment for materials.

NOTE See the EU Directive 97/23/EC, Annex I, section 4.3 third paragraph and for further information the Guidelines of the EU Commission and the Member States for its interpretation (see e.g. Guidelines 7/2 and 7/16).

9.2 Inspection documents
9.2.1 Types of inspection documents
The following inspection documents, in accordance with EN 10204, shall be issued;
- test report 2.2 for quality TR1;
- inspection certificate 3.1 for quality TR2.
Option 9: One of the following inspection documents, specified by the purchaser, shall be issued:
- for quality TR1 specific inspection with inspection certificate 3.2;
- for quality TR2, an inspection certificate 3.2.
If an inspection certificate 3.2 is specified, the purchaser shall notify the manufacturer of the name and address of the organization or person who is to carry out the inspection and produce the inspection document, and it shall be agreed which party shall issue the certificate.
Document 3.1 and 3.2 are to be validated by the manufacturer’s authorized representative.

9.2.2 Content of inspection documents
9.2.2.1 The content of the inspection document shall be in accordance with EN 10168 as shown in 9.2.2.2 and9.2.2.3.
In all types of inspection documents, a statement on the conformity of the products delivered with the requirements of this specification and the order shall be included.
9.2.2.2 For tubes supplied with non-specific inspection, the test report shall contain the following codes and information:

 A   commercial transactions and parties involved;
 B   description of products to which the inspection document applies;
 C02   direction of test pieces;
 C10–C13 tensile test;
 C71–C92 chemical composition;
 D01   marking and identification, surface appearance, shape and dimensional properties;
 D02–D99 leak-tightness test;
 Z    validation.
9.2.2.3 For tubes supplied with specific inspection the inspection certificate shall contain the following codes and information:
 A  commercial transactions and parties involved;
 B   description of products to which the inspection document applies

 C02–C03 direction of test pieces and testing temperature;
 C10–C13 tensile test;
 C40–C43 impact test, if applicable;
 C71–C92 chemical composition on cast analysis (product analysis if applicable);
 D01   marking and identification, surface appearance, shape and dimensional properties;
 D02–D99 leak-tightness test; NDT if applicable;
 Z    validation.
In addition, for inspection document 3.1 the manufacturer shall state the references to the certificate (see 9.1) of the appropriate “quality-assurance system“, if applicable

9.3 Summary of inspection and verification testing
Table 10 — Summary of inspection and verification testing for quality TR1

Table 11 — Summary of inspection and verification testing for quality TR2

10 Sampling

10.1 Frequency of tests
10.1.1 Test unit
In case of specific inspection, a test unit shall comprise:
 Quality TR1: Tubes of the same specified outside diameter and wall thickness, the same steel grade, the same manufacturing process and, if applicable, the same normalising treatment in a continuous furnace or heat-treated in the same furnace charge in a batch-type furnace.
 Quality TR2: Tubes of the same specified outside diameter and wall thickness, the same steel grade, the same cast, the same manufacturing process and, if applicable, the same normalising treatment in a continuous furnace or heat-treated in the same furnace charge in a batch-type furnace. Tubes with specified outside diameter less than or equal to 76.1 mm need not be separated by cast unless Option 10 is specified.
The number of tubes, in manufacturing lengths, per test unit shall conform to Table 12.
The manufacturing length (e.g. the rolled length after the normalising forming process) may differ from the delivery length providing there is no additional HT after cutting the manufacturing lengths into individual lengths.
Option 10: Tubes with specified outside diameter less than or equal to 76,1 mm shall be separated by cast for quality TR2 .

Table 12 — Number of tubes per test unit

10.1.2 Number of sample tubes per test unit
One sample tube shall be taken from each test unit.
10.2 Preparation of samples and test pieces
10.2.1 Selection and preparation of samples for product analysis Samples for product analysis shall be taken from the test pieces or samples for mechanical testing or from the whole thickness of the tube at the same location as the mechanical test samples, in accordance with EN ISO 14284.
10.2.2 Location, orientation and preparation of samples and test pieces for mechanical tests
10.2.2.1 General
Samples and test pieces shall be taken at the tube ends and in accordance with the requirements of EN ISO 377.

10.2.2.2 Test pieces for tensile test
The test pieces for tensile test shall be prepared in accordance with EN ISO 6892-1.
At the manufacturer's discretion:
for tubes with an outside diameter D ≤ 219,1 mm the test piece shall be either a full tube section or a strip section and shall be taken in a direction longitudinal to the axis of the tube;
for tubes with an outside diameter D > 219,1 mm the test piece shall either a machined test piece with circular cross section from an unflattened sample or a strip section and be taken in a direction either longitudinal or transverse to the axis of the tube.
10.2.2.3 Test pieces for impact test
Three standard Charpy V-notch test pieces shall be prepared in accordance with EN ISO 148-1. If the wall thickness is such that standard test pieces cannot be produced without flattening of the section, then test pieces of width less than 10 mm, but not less than 5 mm shall be prepared; the largest obtainable width shall be used.
Where test pieces at least 5 mm width cannot be obtained, the tubes shall not be subjected to impact testing.
Unless otherwise specified (see Option 4), the test pieces shall be taken transverse to the tube axis unless D min , as calculated by the following equation, is greater than the specified outside diameter, in which case longitudinal test pieces shall be used:
D min = (T-5) + [ 756,25 / (T-5) ] (1)
The test pieces shall be prepared such that the axis of the notch is perpendicular to the surface of the tube,see Figure 2.

Key
1 longitudinal test piece
2 transverse test piece
w specimen width

Figure 2 — Impact test piece orientation

11 Verification test methods

11.1 Chemical analysis
The elements to be determined and reported shall be those specified in Table 2. The choice of a suitable physical or chemical analytical method for the analysis shall be at the discretion of the manufacturer. In cases of dispute, the method used shall be agreed between manufacturer and purchaser taking into account CEN/TR 10261.

11.2 Tensile test
The test shall be carried out at room temperature in accordance with EN ISO 6892-1, and the following shall be determined:
 the tensile strength (R m );
 the upper yield strength (R eH ) or if a yield phenomenon is not present the 0,2 % proof strength (R p0,2 );
 the percentage elongation after fracture with a reference to a gauge length ( L 0 ) of So ⋅ 65 , 5 ; if a nonproportional test piece is used, the percentage elongation value shall be converted to the value for a gauge length So Lo ⋅ = 65 , 5 using the conversion tables in EN ISO 2566-1.

11.3 Impact test
11.3.1 The test shall be carried out (but see 10.2.2.3) in accordance with EN ISO 148-1 at 0 °C and, if option 4 is specified, at -10 °C.
11.3.2 The mean value of the three test pieces shall meet the requirements given in Table 5 and Table 6. One individual value may be below the specified value, provided that it is not less than 70 % of that value.
11.3.3 If the width (W) of the test piece is less than 10 mm, the measured impact energy (KV p ) shall be converted to the calculated impact energy( KV c ) using the following equation:

where
KV c is the calculated impact energy, in joules;
KV p is the measured impact energy, in joules;
W is the width of the test piece, in millimetres.
The calculated impact energy KV c shall conform to the requirements given in 11.3.2.

11.3.4 If the requirements of 11.3.2 are not met, then an additional set of three test pieces may be taken at the discretion of the manufacturer from the same sample and tested. To consider the test unit as conforming, after testing the second set, the following conditions shall be satisfied simultaneously:
 the average value of the six tests shall be equal to or greater than the specified minimum value;
 not more than two of the six individual values may be lower than the specified minimum value;
 not more than one of the six individual values may be lower than 70 % of the specified minimum average value.
11.3.5 The dimensions in millimetres of the test pieces, the measured impact energy values and the resulting average value shall be reported.

11.4 Leak tightness test
11.4.1 Hydrostatic test
The hydrostatic test shall be carried out at a test pressure of 70 bar 1) or at a test pressure P calculated using the following equation, whichever is lower:

where
P is the test pressure, in bar;
D is the specified outside diameter, in millimetres;
T is the specified wall thickness, in millimetres;
S is the stress, in MPa, corresponding to 70 % of the specified minimum yield strength (see Table 5 and Table 6) for the steel grade concerned.

The test pressure shall be held for not less than 5 s for tubes with an outside diameter D less than or equal to 457 mm and for not less than 10 s for tubes with an outside diameter D greater than 457 mm.
The tube shall withstand the test without showing leakage.
NOTE This hydrostatic leak-tightness test is not a strength test.

11.4.2 Electromagnetic test
The test shall be carried out in accordance with EN ISO 10893-1.

11.5 Dimensional inspection
Specified dimensions, including straightness, shall be verified.
The outside diameter shall be measured at tube ends. For tubes with outside diameter D ≥ 406,4 mm, the diameter may be measured using a circumference tape.
Unless Option 11 is specified the wall thickness shall be measured at both tube ends.
Option 11: The wall thickness shall be measured away from the tube ends in accordance with an agreed procedure.

11.6 Visual examination
Tubes shall be visually examined to ensure conformity to the requirements of 8.4.1.
11.7 Non-Destructive Testing
When Option 6 is specified, the tubes of quality TR2 shall be subjected to Non-Destructive testing for the detection of longitudinal imperfections in accordance with EN ISO 10893-2, EN ISO 10893-3 or EN ISO 10893-10 to acceptance level 3, sub-category C, where applicable.
Regions at the tube ends not automatically tested shall either be subjected to manual/semi-automatic ultrasonic testing in accordance with EN ISO 10893-10 or be cropped off.

11.8 Retest, sorting and reprocessing
For retest, sorting and reprocessing the requirements of EN 10021 shall apply.

12 Marking

12.1 Marking to be applied
The marking shall be indelibly marked on each tube at least at one end. For tubes with outside diameter D ≤ 51 mm the marking on tubes may be replaced by the marking on a label attached to the bundle or box.
The marking shall include the following information:
 the manufacturer's name or trade mark;
 the number of this European Standard and the steel name (see 5.2).
In addition in case of specific inspection:
 the cast number or a code number;
 the mark of the inspection representative;
 an identification number (e.g. order or item number), which permit the correlation of the product or delivery unit to related documents.

Example of marking:
EXAMPLE X – EN 10216-1 - P265TR2 - Y - Z 1 - Z 2
where
X is the manufacturer's mark;
Y is the cast number or the code number;
Z 1 is the mark of the inspection representative;
Z 2 is the identification number.

12.2 Additional marking
Option 12: Additional marking, as agreed upon at the time of the enquiry and order, shall be applied.

13 Protection

The tubes shall be delivered without a temporary protective coating.
Option 13: A temporary protective coating or durable coating and/or lining shall be applied.

Seamless tube processing

With years of expertise, we provide a diverse array of steel tube processing options. From sawing and machining tube blanks to intricate bending and upsetting operations, we actively assist you throughout your projects.

Our capabilities extend to eccentricity reduction and concentricity enhancement through turning and grinding. We excel in creating complex geometries using processes like rotary swaging and axial forming. Additionally, we offer property modifications via partial heat treatment, ensuring tailored solutions for your specific needs.

Inspection

Chemical composition inspection, mechanical properties test(tensile strength,yield strength, elongation, flaring, flattening, bending, hardness, impact test), surface and dimension test,no-destructive test, hydrostatic test.

PMI

identification of the chemical composition of the metal used to manufacture the fitting. Uses PMI sensors, including X-ray fluorescence or optical emission spectrometry.

Size measurement

Seamless pipes with compound bevels as per ASME B16-25 And ASTM A333

Delivery

Steel pipe delivery status(condition)

Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).

Cold rolled steel coil substrate products deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, PVC laminating steel plates, etc., so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.

Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.

Packing

Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.

Placing steel pipes into containers

There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method to work prevent rusting and Sea transportation security.

• Plastic caps plugged at the two sides of pipe ends
• Should be avoided by the steel strapping and transport damage
• Bundled signs should be uniform and consistent
• The same bundle(batch) of steel pipe should be came from the same furnace.
• The steel pipe has the same furnace number, the same steel grade, the same specifications.

Our packing can meet any needs of the customers.

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The most important and desired changes in alloy steel are

Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.

• Increased hardenability.
• Increased corrosion resistance.
• Retention of hardness and strength.
• Nearly all alloy steels require heat treatment in order to bring out their best properties.

Alloying Elements & Their Effects

• Chromium – Adds hardness. Increased toughness and wear resistance.
• Cobalt – Used in making cutting tools; improved Hot Hardness (or Red Hardness).
• Manganese – Increases surface hardness. Improves resistance to strain, hammering & shocks.
• Molybdenum – Increases strength. Improves resistance to shock and heat.
• Nickel – Increases strength & toughness. Improves corrosion resistance.
• Tungsten – Adds hardness and improves grain structure. Provides improved heat resistance.
• Vanadium – Increases strength, toughness and shock resistance. Improved corrosion resistance.
• Chromium-Vanadium – Greatly improved tensile strength. It is hard but easy to bend and cut.

Pipes, Tubes and Hollow Sections

Norms

• API 5L – Line Pipe
• ASTM A 53 – Black and Hot-Dipped, Zinc-Coated, Welded and Seamless, Steel Pipe
• ASTM A 106 – Seamless Carbon Steel Pipe for High-Temperature Service
• ASTM A 213 – Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
• ASTM A 269 – Seamless and Welded Austenitic Stainless Steel Tubing for General Service
• ASTM A 312 – Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
• ASTM A 333 – Seamless and Welded Steel Pipe for Low-Temperature Service
• ASTM A 335 – Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
• ASTM A 358 – Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications
• ASTM A 671 – Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
• ASTM A 672 – Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures
• ASTM A 790 – Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
• ASTM A 928 – Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
• EN 10208-2 – Steel pipes for pipelines for combustible fluids – Part 2: Pipes of requirement class B
• EN 10210-1/2 – Hot finished structural hollow sections of non-alloy and fine grain steels
• EN 10216-1 – Seamless steel tubes for pressure purposes – Part 1: Non-alloy steel tubes with specified room temperature properties
• EN 10216-2 – Seamless steel tubes for pressure purposes – Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
• EN 10217-1 – Welded steel tubes for pressure purposes – Part 1: Non-alloy steel tubes with specified room temperature properties
• EN 10217-2 – Welded steel tubes for pressure purposes – Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
• EN 10219-1/2 – Cold formed welded structural hollow sections of non-alloy and fine grain steels
• EN 10297-1 – Seamless circular steel tubes for mechanical and general engineering purposes – Part 1 Non-alloy and alloy steel tubes

Grade

• API 5L Gr. A, B, X42, X52, X60, X65, X70
• ASTM A 53 Gr. A, Gr. B
• ASTM A106 Gr. A, B, C
• ASTM A 213 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H, T5, T9, T11
• ASTM A 269 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
• ASTM A 312 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
• ASTM A 333 Gr. 3, Gr. 6 ASTM A 335 P1, P2, P5, P9, P11, P12, P22, P91, P92
• ASTM A 358 TP 304, 304L, 304H, 316, 316L, 316H, 321, 321H
• ASTM A 671 CC 60, CC 65, CC 70
• ASTM A 672 CC 60, CC 65, CC 70
• ASTM 790 UNS S31803, UNS S32205, UNS S32750, UNS S32760
• ASTM A928
• EN 10208-2 L245, L 290, L360
• EN 10210-1 S235 JRH, S275 JOH, S275 J2H, S355 JOH, S355 J2H
• EN 10216-1 P235 TR1/2
• EN 10216-2 P235 GH, P265 GH
• EN 10217-1 P235 TR1/2, P275 TR1/2
• EN 10217-2 P235 GH, P265 GH
• EN 10219-1 S235 JRH, S275 JOH, S275 J2H, S355 JOH, S355 J2H
• EN 10297-1 E235, E275, E315, E355, E470

Alloying Elements

Commonly used alloying elements and their effects are listed in the table given below.