JIS G3429 seamless tubes are high-quality steel tubes designed for use in high-pressure environments such as gas cylinders. These tubes are manufactured to meet the stringent requirements of the Japanese Industrial Standards (JIS) and offer excellent strength, durability, and corrosion resistance.

Key Features

• Material: High-grade steel alloys for optimal performance in high-pressure applications.
• Applications: Used primarily in the manufacturing of gas cylinders and other high-pressure vessels.
• Seamless Construction: Seamless design ensures uniform strength and reduces the risk of leaks or failure under pressure.
• Standard Compliance: Conforms to JIS G3429 standards for high-pressure gas cylinder applications.

Grades

• JIS G3429 STH11
• JIS G3429 STH12
• JIS G3429 STH22
• JIS G3429 STH24

Mechanical Properties

Applications

• Gas cylinders for industrial gases.
• High-pressure vessel construction.
• Storage of compressed air, oxygen, and other gases.
• Automotive and aerospace applications requiring high-pressure gas containment.

Japanese Industrial Standards for steel

Japanese Industrial Standards (JIS) developed by the organization apply to a wide variety of industrial services and technologies such as automobiles, metallurgy, ships and medical equipment

The method for making cold-drawn seamless pipes involves taking a round “billet” or bar of steel and boring it in the center, turning it, cutting it, heating it to make it more pliable, then “drawing” it (extruding or pulling it) to make it a longer and thinner tube.

Japanese Industrial Standards specifies the standards used for industrial activities in Japan. The standardization process is coordinated by Japanese Industrial Standards Committee and published through Japanese Standards Association.

The Industrial Standardization Law was revised in 2004 and the JIS mark product certification system was changed. Standards are named like “JIS X 0208:1997″, where X denotes area division, followed by four digits (or five digits for some of the standards corresponding ISO standards) and the revision release year.

• G – Ferrous Materials and Metallurgy
• H – Nonferrous Materials and Metallurgy

MTC IN EN 10204.3

EN 10204:2004 is for metallic products-and this norm tell us things about Types of inspection documents. There are no material standards.

Mostly material is defined with its chemical composition and mechanical properties in a public standars like ISO, EN, JIS, ASTM etc.

What is JIS?

Japanese Industrial Standards (JIS) specifies the standards used for industrial activities in Japan. The standardization process is coordinated by Japanese Industrial Standards Committee and published through Japanese Standards Association.

Tolerance of JIS seamless pipe

Table 1: Tolerance on Outside Diameter in JIS G3441, G3444, G3445

Table 2: Tolerance on Wall Thickness in JIS G3441, G3444, G3445

Table 3: Tolerance on Outside Diameter and Wall Thickness in JIS G3454

Table 4: Tolerance on Outside Diameter and Wall Thickness in JIS G3455, G3456, G3458, G3460

Table 5: Tolerance on Outside Diameter in JIS G3461, G3462, G3464

Table 6: Tolerance on Wall Thickness in JIS G3461, G3462, G3464

Table 7: Tolerance on the Length in JIS G3461, G3462, G3464

Table 8: Tolerance on Outside Diameter in JIS G3465

JIS Number and Corrensponding Foreign Standards

In the Meiji era, private enterprises were responsible for making standards. However, the Japanese government did have standards and specification documents for procurement purposes for certain articles, such as munitions. These were summarized to form an official standard old JES in 1921. During World War II, simplified standards were established to increase matériel output. The Industrial Standardization Law was enacted in 1949, which forms the legal foundations for the present Japanese Industrial Standards.

Measurement size & Testing

• JIS seamless pipe testing covers many specifications, including alloy, size, toughness and composition.
• Those using steel products purchase the product that fulfills the requirements they need for what they are building.
• How To Measure Hardness Of Steel Pipe

Packing

• Packed in wooden crates, wrapped in plastic, and suitably protected for sea-worthly delivery or as requested.
• Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.

Delivery

• Pipes are supplied in hexagonal bundles or round bundles tied with steel strip.
• Weight of bundle – up to 5000 kg upon request of customer.
• Each bundle is furnished with three tags.

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.