15CrMoG
High-quality 15CrMoG material, suitable for high-pressure environments.
GB 5310 12Cr2MoWVTiB high pressure seamless boiler tubes are designed and manufactured according to the Chinese national standard GB/T 5310-2017.
GB 5310 12Cr2MoWVTiB high pressure seamless boiler tubes are a type of seamless steel tubes or pipes designed and manufactured according to the Chinese national standard GB/T 5310-2017. As stated in [1], they are made of pearlitic heat-resistant steel with a composition including Cr, Mo, W, V and Ti, which offer excellent high-temperature mechanical properties and corrosion resistance.
GB 5310 12Cr2MoWVTiB high pressure seamless boiler tubes are typically used in high-pressure boilers with working pressure above 9.8 MPa and working temperature between 450℃ and 650℃. They are mainly used for making superheaters, reheaters, steam pipes, and other high-pressure components in power plant boilers.
GB 5310 12Cr2MoWVTiB high-pressure seamless boiler tubes must meet strict standards for production and use, ensuring their safety and reliability in high-pressure applications. They come in various lengths, outer diameters, wall thicknesses, and end types such as plain end, beveled end, or threaded ends.
12Cr2MoWVTiB boiler pipe is suitable for general structure, fluid transport, low and medium pressure boiler or boiling water piping, pipe size locomotive, petroleum, chemical, electric, power, high temperature, low temperature, corrosion, seamless refined plant, oil refining furnace, heat exchange tubes, fertilizer equipment, pipeline works etc.
12Cr2MoWVTiB steel is a kind of multi-element microalloyed low-alloy bainite heat-resistant steel developed by ourselves from the end of 1960s to the middle of 1970s in China. Due to the proper coordination of various alloy elements, the steel has high heat strength, and its heat strength performance and service temperature are higher than those of the same kind of steel abroad. Therefore, 12Cr2MoWVTiB can be used for boiler superheat tube panel and reheat The manufacture of boiler tube and main steam tube, in which superheater tube and reheater tube are called serpentine tube.
Temperature application range: wall temperature ≤ 600 ℃ (620 ℃ can be used when considering oxidation loss in strength calculation)
| Grade | C | Si | Mn | Cr | Mo | V |
|---|---|---|---|---|---|---|
| 12Cr2MoWVTiB | 0.08-0.15 | 0.45-0.75 | 0.45-0.65 | 1.60-2.10 | 0.50-0.65 | 0.28-0.42 |
| Ti | B | W | P | S | ||
| 0.08-0.18 | 0.002-0.008 | 0.30-0.55 | ≤0.025 | ≤0.015 |
| Grade | Tensile strength(MPa) | Yield strength(MPa) | Elongation | Hardness |
|---|---|---|---|---|
| 12Cr2MoWVTiB | 540-735 | ≥345 | ≥18% | --- |
| W.T.(S) | Tolerance of W.T. | |
|---|---|---|
| <3.5 | +15%(+0.48mm min) | |
| -10%(+0.32mm min) | ||
| 3.5-20 | +15%,-10% | |
| >20 | D<219 | ±10% |
| D≥219 | +12.5%,-10% | |
(1) Forging:
The start temperature of rolling (forging) of 12Cr2MoWVTiB steel is 1150 ~ 1200ec, and the end temperature is 850 ° C. after rolling (forging), the steel is cooled by stacking.
(2) Cold bending
12Cr2MoWVTiB steel is mainly used for small-diameter steel tubes. Generally, the steel pipes need to be cold bent and do not need heat treatment after cold bending.
(3) Heat treatment process (according to GB5310-2008 standard)
Normalizing and tempering: normalizing temperature: 1020ec ~ 1060 ° C; holding for 30min; tempering temperature: 760ec ~ 790ec, holding for 3h; normalizing structure is granular bainite, normalizing + high temperature tempering structure is tempered bainite.
(4) Selection of welding materials:
The weldability of 12Cr2MoWVTiB steel is good. It can be used for manual arc welding, gas welding, friction welding, TIG welding and plasma welding. R347 welding rod is used for manual arc welding, h08cr2movnb welding wire is used for gas welding, butt joint with 12Cr1MoV steel, h08crmov or h08cr2movnb welding wire is used. Neutral partial oxidation flame is suitable for gas welding. After welding, it shall be normalized at 1000-1030 ℃ and tempered at 760-780 ° C. before manual arc welding with thickness greater than 6mm, it shall be preheated to 250-300ec, and tempered at 760-780 ° C after welding. After butt welding, it should be heated to 780ec, kept warm for 40 minutes, and then cooled to below 400ec.
◆Professor Liu rongzao put forward the theory of multiple composite strengthening in the 1960s, developed G102 (12Cr2MoWVTiB) in the late 1960s and G106 (10cr5mowvtib) in the 1970s
◆Professor Liu rongzao's theory and G102's success, Professor V.K. Sikka of the United States adores very much, and T91 research and development has been successful.
◆T23 (HCM2S, cc2199-3, 6cr2w2monbvnb) developed in Japan and T24 (cc2514, 6cr2mo1vtinb) developed in Europe are all G102 modifications.
In 1982, when Shanghai Boiler Plant and Harbin boiler plant introduced the manufacturing technology of 300MW and 600MW Subcritical controlled circulation boiler from CE company of the United States, CE company of the United States agreed to use 12Cr2MoWVTiB (steel 102) steel pipe instead of TP347H and TP304H steel tubes to manufacture 300MW and 600MW boiler high temperature superheater and reheater. In the superheater, the actual maximum design temperature of 102 steel tube is 580x ℃; in the reheater, the actual maximum design temperature of 102 steel pipe is 599 ℃.
According to DL / t715_, 12Cr2MoWVTiB steel is mainly used for superheater and reheater pipes with wall temperature not higher than 600 ° C; however, according to DL / T 715-2015, it is mainly used for superheater pipes and reheater pipes with wall temperature not higher than 575 ° C. It can be seen that the upper limit of service temperature in 2015 version is 25 ° C lower than that in 2000 version, which may be due to the serious oxidation problem when the steel is used in the steam side of the heating surface tube.
UT(Ultrasonic examination), AR(As Hot Rolled only), TMCP(Thermal Mechanical Control Processing), N(Normalized), Q+T(Quenched and Tempered),Z Direction Test(Z15,Z25,Z35), Charpy V-Notch Impact Test, The Third Party Test (such as SGS Test), Coated or Shot Blasting and Painting.
GB 5310 is a standard for seamless tubes used in high-pressure steam boilers and pipelines. The main application for GB 5310 tubes is as high-pressure pipeline tubes in boiler projects. These tubes can be used for superheaters, reheaters, and windpipes.
The GB 5310 standard applies to tubes made from materials such as:
The long-term use temperature for GB 5310 20G seamless steel pipes used as headers and steam pipes is ≤ 425 ° C.
| Steel Grade | C | Si | Mn | S | P | Cr | Mo | V | Ti | B | W | Ni | Al | Nb | N |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20G | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | 0.015 | 0.025 | ||||||||||
| 20 MnG | 0.17-0.24 | 0.17-0.37 | 0.70-1.00 | 0.015 | 0.025 | ||||||||||
| 25MnG | 0.22-0.27 | 0.17-0.37 | 0.70-1.00 | 0.015 | 0.025 | ||||||||||
| 15MoG | 0.12-0.20 | 0.17-0.37 | 0.40-0.80 | 0.015 | 0.025 | 0.25-0.35 | |||||||||
| 20MnG | 0.15-0.25 | 0.17-0.37 | 0.40-0.80 | 0.015 | 0.025 | 0.44-0.65 | |||||||||
| 12CrMoG | 0.08-0.15 | 0.17-0.37 | 0.40-0.70 | 0.015 | 0.025 | 0.40-0.70 | 0.40-0.55 | ||||||||
| 15CrMoG | 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | 0.015 | 0.025 | 0.80-1.10 | 0.40-0.55 | ||||||||
| 12Cr2MoG | 0.08-0.15 | ≤0.60 | 0.40-0.60 | 0.015 | 0.025 | 2.00-2.50 | 0.90-1.13 | ||||||||
| 12Cr1MoVG | 0.08-0.15 | 0.17-0.37 | 0.40-0.70 | 0.010 | 0.025 | 0.90-1.20 | 0.25-0.35 | 0.15-0.30 | |||||||
| 12Cr2MoWVTiB | 0.08-0.15 | 0.45-0.75 | 0.45-0.65 | 0.015 | 0.025 | 1.60-2.10 | 0.50-0.65 | 0.28-0.42 | 0.08-0.18 | 0.002-0.008 | 0.30-0.55 | ||||
| 10Cr9Mo1VNbN | 0.08-0.12 | 0.20-0.50 | 0.30-0.60 | 0.010 | 0.020 | 8.00-9.50 | 0.85-1.05 | 0.18-0.25 | ≤0.040 | ≤0.040 | 0.06-0.10 | 0.03-0.07 |
Manufacturing methods
Steel smelting method
High-quality carbon structural steel and alloy structural steel shall be smelted by electric furnace plus furnace refining, oxygen converter plus furnace refining or electroslag remelting method, and steel refined outside the furnace shall be subjected to vacuum degassing treatment.
10Cr9Mo1VNbN, 10Cr9MoW2VNbBN, 10Cr11MoW2VNbCu1BN, 11Cr9Mo1W1VNbBN and stainless (heat-resistant) steel should be smelted by electric furnace plus furnace refining or electroslag remelting. The steel refined outside the furnace should be vacuum degassed.
After consultation between the supplier and the buyer, and indicating in the contract, other higher-required smelting methods may be adopted. When the purchaser specifies a certain smelting method, it should be indicated in the contract.
Manufacturing methods and requirements for tube blanks
The tube blank can be produced by continuous casting, die casting or hot rolling (forging).
Continuous casting tube blanks shall comply with the provisions of YB/T 4149, in which the level of low-fold structural defects shall not exceed 1; the hot-rolled (forged) tube blanks shall comply with the provisions of YB/T ××××; It is carried out in accordance with the regulations for hot-rolled (forged) tube blanks.
Manufacturing method of steel pipe
Steel pipes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling). Steel pipes of grade 08Cr18Ni11NbFG shall be manufactured by cold drawing (rolling) seamless method.
Delivery status
The steel pipe shall be delivered in a heat treated condition. The heat treatment system for steel pipes shall comply with the requirements of Table 4. The heat treatment system for steel pipes should be filled in the quality certificate.
| No. | Steel Pipe | Heat treatment |
|---|---|---|
| 1 | 12Ga、20Ga | 880 ℃～940 ℃,Normalizing |
| 2 | 20MnGa、25MnGa | 880 ℃～940 ℃,Normalizing |
| 3 | 15MoGa、20MoGa | 890 ℃～950 ℃,Normalizing |
| 4 | 12CrMoGa | 900 ℃～960 ℃,Normalizing；650 ℃～730 ℃,Tempering |
| 5 | 15CrMoGa | 900 ℃～960 ℃,Normalizing；660 ℃～730 ℃,Tempering |
| 6 | 12Cr2MoGa | 900 ℃～960 ℃,Normalizing；700 ℃～750 ℃,Tempering It can also be heated to 900 °C ~ 960 °C, and the furnace is cooled to 700 °C for more than 1 h, and air-cooled. |
| 7 | 12Cr1MoVGa | 980 ℃～1 020 ℃,Normalizing，980 °C ~ 1 020 °C normalizing, when the wall thickness is greater than 30 mm, forced cooling; 720 °C ~ 760 °C tempering. |
| 8 | 12Cr2MoWVTiB | 1 000 ℃～1 035 ℃,Normalizing；760 ℃～790 ℃,Tempering |
| 9 | 07Cr2MoW2VNbB | ≥1 040 ℃,Normalizing，≥730 ℃,Tempering |
| 10 | 08Cr2Mo1W2VTiB | ≥980 ℃,Normalizing，≥730 ℃,Tempering |
| 11 | 12Cr3MoVSiTiB | 1 040 ℃～1 060 ℃,Normalizing；720 ℃～770 ℃,Tempering |
| 12 | 09Ni1MnMoNbCu | 880 ℃～980 ℃,Normalizing，580 ℃～680 ℃,Tempering |
| 13 | 10Cr9Mo1VNbN | ≥1 040 ℃,Normalizing，≥730 ℃,Tempering |
| 14 | 10Cr9MoW2VNbBN | ≥1 040 ℃,Normalizing，≥730 ℃,Tempering |
| 15 | 10Cr11MoW2VNbCu1BN | ≥1 040 ℃,Normalizing，≥730 ℃,Tempering |
| 16 | 11Cr9Mo1W1VNbBN | 1 040 ℃～1 080 ℃,Normalizing，740 ℃～780 ℃,Tempering |
| 17 | 15Cr18Ni9b | Solution treatment: solution temperature ≥1 040 °C. |
| 18 | 10Cr18Ni9NbCu3BNb | Solution treatment: solution temperature ≥ 1 100 °C. |
| 19 | 07Cr25Ni21NbNcd | Separate solution treatment: solution temperature ≥ 1 100 °C. |
| 20 | 08Cr18Ni11Nbbd | Solution treatment: solution temperature ≥1 040 °C. |
| 21 | 07Cr18Ni11Nbcd | Separate solution treatment: hot rolling (extrusion, expansion) steel tube solid solution temperature ≥ 1 050 °C, cold drawn (rolled) steel tube solid solution temperature ≥ 1100 °C. |
| 22 | 08Cr18Ni10NbFG | Softening heat treatment before cold working: softening heat treatment temperature should be at least 50 °C higher than solution heat treatment temperature; solution treatment after final cold working: solution temperature ≥1 180 °C |
| a. The finishing temperature of the hot-rolled steel pipe is at the critical temperature of the phase transition Ar3 to the upper limit of the temperature specified in the table, and when the steel pipe is air-cooled, the steel pipe is considered to be normalized. b. The finishing temperature of the hot-rolled steel pipe meets the solid solution temperature specified in the table. As an alternative to the solid solution treatment method, the steel pipe can be separately quenched by water or cooled by other fast enough methods. c, the solution treatment should be a separate heat treatment, and the heat treatment in the process is not allowed to replace the separate solution treatment. d. According to the requirements of the purchaser, the steel pipes of the grades 07Cr25Ni21NbN, 08Cr19Ni10Nb and 07Cr18Ni11Nb may be subjected to a stabilization heat treatment lower than the initial solution treatment temperature after the solution treatment, and the temperature of the stabilization heat treatment is negotiated between the supplier and the purchaser. |
||
| Grade | Tensile strength (Mpa) |
Yield point(Mpa) not less than |
Elongation(%) not less than |
Impact(J) not less than |
|---|---|---|---|---|
| 20G | 410-550 | 245 | 24/22 | 40/27 |
| 25MnG | 485-640 | 275 | 20/18 | 40/27 |
| 15MoG | 450-600 | 270 | 22/20 | 40/27 |
| 20MnG | 415-665 | 220 | 22/20 | 40/27 |
| 12CrMoG | 410-560 | 205 | 21/19 | 40/27 |
| 12Cr2MoG | 450-600 | 280 | 22/20 | 40/27 |
| 12Cr1MoVG | 470-640 | 255 | 21/19 | 40/27 |
| 12Cr2MoWVTiB | 540-735 | 345 | 18 | 40/27 |
| 10Cr9Mo1VNb | ≥585 | 415 | 20 | 40 |
| 1Cr18Ni9 | ≥520 | 206 | 35 | |
| 1Cr19Ni11Nb | ≥520 | 206 | 35 |
GB seamless steel pipes are available from various manufacturers and suppliers in China. They come in different sizes, grades, and surface finishes to meet specific project requirements.
According to incomplete statistics, there are more than 240 national standard steel pipe production enterprises and more than 250 seamless steel pipe units.
| Steel Grade | Chemistry Constitute | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | Cr | Ni | Mo | P | S | Ti | Cu | |
| Q195 | 0.06-0.12 | ≤0.30 | 0.25-0.50 | ≤0.3 | ≤0.3 | - | ≤0.045 | ≤0.050 | - | ≤0.30 |
| Q235 | 0.14-0.22 | ≤0.30 | 0.30-0.65 | ≤0.3 | ≤0.3 | - | ≤0.045 | ≤0.050 | - | ≤0.30 |
| Q345B | ≤0.20 | ≤0.55 | 1.00-1.60 | - | - | - | ≤0.040 | ≤0.040 | - | - |
| 10# | 0.07-0.13 | 0.07-0.37 | 0.35-0.65 | ≤0.15 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.25 |
| 20# | 0.17-0.23 | 0.07-0.37 | 0.35-0.65 | ≤0.25 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.25 |
| 35# | 0.32-0.39 | 0.07-0.37 | 0.50-0.80 | ≤0.25 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.25 |
| 45# | 0.42-0.50 | 0.07-0.37 | 0.50-0.80 | ≤0.25 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.25 |
| 20Cr | 0.18-0.24 | 0.07-0.37 | 0.50-0.80 | 0.70-1.00 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 40Cr | 0.37-0.44 | 0.07-0.37 | 0.50-0.80 | 0.80-1.10 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 20CrMo | 0.17-0.24 | 0.07-0.37 | 0.40-0.70 | 0.80-1.10 | ≤0.3 | 0.15-0.25 | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 30CrMo | 0.26-0.34 | 0.07-0.37 | 0.40-0.70 | 0.80-1.10 | ≤0.3 | 0.15-0.25 | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 35CrMo | 0.32-0.40 | 0.07-0.37 | 0.40-0.70 | 0.80-1.10 | ≤0.3 | 0.15-0.25 | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 42CrMo | 0.38-0.45 | 0.07-0.37 | 0.50-0.80 | 0.90-1.20 | 1.00-1.40 | 0.15-0.25 | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 20CrMoTi | 0.17-0.23 | 0.07-0.37 | 0.40-0.70 | 0.45-0.75 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 35Mn2 | 0.32-0.39 | 0.07-0.37 | 1.40-1.80 | ≤0.3 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 40Mn2 | 0.37-0.44 | 0.07-0.37 | 1.40-1.80 | ≤0.3 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 35SiMn | 0.32-0.40 | 1.10-1.40 | 1.10-1.40 | ≤0.3 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.30 |
| 15Mn | 0.12-0.16 | 0.07-0.37 | 0.70-1.00 | ≤0.25 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.25 |
| 20Mn | 0.17-0.23 | 0.07-0.37 | 0.70-1.00 | ≤0.25 | ≤0.3 | - | ≤0.035 | ≤0.035 | - | ≤0.25 |
| Deviation level | Standardized outer diameter tolerance |
|---|---|
| D1 | ±1.5%，min ±0.75 mm |
| D2 | ±1.0%。min ±0.50 mm |
| D3 | ±0.75%．min±0.30 mm |
| D4 | ±0.50%。min ±0.10 mm |
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.
Alloy steel pipes are ideally suitable for chemical, petrochemicals, and other energy-related applications.
The alloy steel pipe adopts high quality carbon steel, alloy structural steel and stainless & heat resisting steel as raw material through hot rolling or cold drawn to be made.
Alloy steel can be used in process area where carbon steel has limitation such as
As an important element of steel products, alloy steel pipe can be divided into seamless steel pipe and welded steel pipe according to the manufacturing technique and tube billet shape.
Here you can see the common alloy steel grade that you will come across.
Why the application of alloy steel pipe is wider than others
There are many kinds of materials used for transport in industrial production. Specifically we will have more choices and it is not limited to the use of alloy steel pipe. But even in the face of more choices, many people tend to choose alloy steel pipe. People make their own choices will have their own reasons. This means the alloy steel pipe application has its own advantages. Compared with transmission lines made of other materials, after it meets the basic application requirements, its quantity is lighter. Then in the practical application of alloy steel pipe, it will have more advantages because of this. Besides its physical characteristic advantage, it also has economic advantages. The wide application of alloy steel pipe is with kinds of reasons. So in practical usage, we can exploit the advantages to the full, in this way can we get more profits in these applications of alloy steel pipe.
The transportation of kinds of gases or liquids in production needs to rely on alloy steel pipe. This shows that the actual role of alloy steel pipe application is important. High temperature resistant and low temperature resistant is the tolerance of temperature. In the practical application of alloy steel pipe, there will be many materials need to be transported. However their temperatures are not the same. So this can be the basic requirement to alloy steel pipe. It needs more corrosion resistance. Corrosion resistant material is the best material during transporting, because it is corrosion resistant. So it can be used in more occasions. And it is definitely very convenient for users.
Can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy steel pipe total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy steel pipe to provide a wider space for the development of the industry. The future needs of the average annual growth of China’s high-pressure alloy steel pipe long products up to 10-12%.
Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.
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 biggest advantages of alloy steel pipe can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy tube total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy tube to provide a wider space for the development of the industry. According to the Chinese Special Steel Association alloy pipe Branch Expert Group, the future needs of the average annual growth of China’s high-pressure alloy pipe long products up to 10-12%.
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.
identification of the chemical composition of the metal used to manufacture the fitting. Uses PMI sensors, including X-ray fluorescence or optical emission spectrometry.
Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).
| Term | Symbol | Explanation |
|---|---|---|
| Cold-finished/hard (cold-finished as-drawn) | BK | No heat treatment after the last cold-forming process. The tubes therefore have only low deformability. |
| Cold-finished/soft (lightly cold-worked) | BKW | After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits. |
| Annealed | GBK | After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum. |
| Normalized | NBK | The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum. |
The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.
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.
Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.
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.
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.
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.
Commonly used alloying elements and their effects are listed in the table given below.
| Alloying Elements | Effect on the Properties |
|---|---|
| Chromium | Increases Resistance to corrosion and oxidation. Increases hardenability and wear resistance. Increases high temperature strength. |
| Nickel | Increases hardenability. Improves toughness. Increases impact strength at low temperatures. |
| Molybdenum | Increases hardenability, high temperature hardness, and wear resistance. Enhances the effects of other alloying elements. Eliminate temper brittleness in steels. Increases high temperature strength. |
| Manganese | Increases hardenability. Combines with sulfur to reduce its adverse effects. |
| Vanadium | Increases hardenability, high temperature hardness, and wear resistance. Improves fatigue resistance. |
| Titanium | Strongest carbide former. Added to stainless steel to prevent precipitation of chromium carbide. |
| Silicon | Removes oxygen in steel making. Improves toughness. Increases hardness ability |
| Boron | Increases hardenability. Produces fine grain size. |
| Aluminum | Forms nitride in nitriding steels. Produces fine grain size in casting. Removes oxygen in steel melting. |
| Cobalt | Increases heat and wear resistance. |
| Tungsten | Increases hardness at elevated temperatures. Refines grain size. |
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
