Alloy seamless steel pipe is a kind of seamless steel pipe, its performance is much higher than the general seamless steel pipe, because this kind of steel pipe contains more Cr, its high temperature resistance, low temperature resistance, corrosion resistance is other seamless steel pipe can not be compared, so the alloy steel pipes in the petroleum, chemical, electric power, boiler and other industries are more widely used.
I. Alloy seamless steel pipe conventional parameters:
i. Size specification:
| Outer Diameter Range (mm) | Wall Thickness Range (mm) | Length Range (mm) |
|---|---|---|
| 10.3 - 48.3 | 1 - 10 | 3000 - 12500 |
| 48.3 - 114.3 | 2 - 15 | |
| 114.3 - 219.1 | 3 - 20 | |
| 219.1 - 323.9 | 4 - 25 | |
| >323.9 | 5 - 30 |
ii. Chemical composition (12Cr2MoG as an example)：
| Element | Content Range (%) |
|---|---|
| Carbon (C) | 0.08 - 0.15 |
| Manganese (Mn) | 0.50 - 0.80 |
| Silicon (Si) | 0.17 - 0.37 |
| Sulfur (S) | ≤0.020 |
| Phosphorus (P) | ≤0.020 |
| Chromium (Cr) | 1.50 - 2.00 |
| Molybdenum (Mo) | 0.88 - 1.00 |
iii. Mechanical properties (12Cr2MoG as an example)：
| Item | Specification |
|---|---|
| Tensile Strength (Rm) | 450 - 600 MPa |
| Upper Yield Strength (ReL) | ≥280 MPa |
| Elongation (A) | Longitudinal ≥22%, Transverse ≥20% |
iv. Allowable deviation of size：
| Outer Diameter Range (mm) | Positive Tolerance on Outer Diameter (mm) | Negative Tolerance on Outer Diameter (mm) | Wall Thickness Allowable Deviation (%) |
|---|---|---|---|
| 10.3 - 48.3 | 0.40 | 0.40 | ±12.5 |
| 48.3 - 114.3 | 0.79 | 0.79 | |
| 114.3 - 219.1 | 1.59 | 0.79 | |
| 219.1 - 323.9 | 2.38 | 0.79 | |
| >323.9 | ±1% D |
v. Other Performance：
| Item | Specification |
|---|---|
| Impact Toughness (KV2) | Longitudinal ≥40J, Transverse ≥27J |
| Brinell Hardness (HBW) | 125 - 180 |
II. Alloy seamless steel pipe classification:
i. Classification by material
Low alloy seamless steel pipe: high strength, good weldability and workability, used in construction, machinery.
Medium alloy seamless steel pipe: good strength and high temperature performance, used in boiler, chemical industry.
High alloy seamless steel pipe: excellent strength and corrosion resistance at high temperature, used in aerospace and nuclear industry.
ii. Classification by use
For fluid transportation: to transport water, oil, gas and other fluids, such as petroleum, chemical pipelines.
For mechanical structure: used for automobile, ship, bridge and other structural parts.
For pressure vessels: used in boilers and pressure vessels, requiring high strength, toughness and weldability.
For oil cracking: resistant to high temperature, high pressure and corrosion, used in oil cracking device.
For ships: seawater corrosion resistant, used in ship structures and equipment.
For geological drilling: high strength and wear resistance, used in geological exploration and drilling.
For automobile half shafts: good strength and toughness, used in automobile half shafts.
For cold drawing (rolling): high dimensional accuracy and good surface, used in precision machinery and instrument piping.
iii. Classification by production process
Hot rolled (extruded) tube: high production efficiency, low cost, dimensional accuracy and surface is slightly poor.
Cold-drawn (rolled) tube: high dimensional accuracy, good surface, high cost, for small diameter, high precision tube.
iv. Classification by surface treatment
Bare tube: smooth surface, no special treatment, widely used.
Galvanized tube: corrosion-resistant, used in construction, chemical industry.
Copper-plated tube: decorative, used for musical instruments and handicrafts.
Tin-plated tube: rust-resistant, used in food processing and packaging.
Nickel-plated tube: corrosion-resistant, wear-resistant, used in chemical industry and electronics.
III. Alloy steel pipe material:
10#、20#、35#、45#、16-50Mn、27SiMn、40Cr、12-42CrMo、16Mn、12Cr1MoV 、T91、27SiMn、30CrMo、15CrMo、20G、Cr9Mo、10CrMo910、15Mo3、15CrMoV、35CrMoV、45CrMo
IV. Seamless pipe Classification:
| Product Name | Spot Material | Standard | Spot Specifications | Product Application |
|---|---|---|---|---|
| Alloy Pipe |
12Cr1MoVG 12CrMoG 15CrMoG 12Cr2Mo Cr5Mo Cr9Mo 10Cr9Mo1VNb 15NiCuMoNb5 12Cr2MoWVTiB |
GB5310-1995 GB6479-2000 GB9948-2006 DIN17175-79 ASTM SA335 ASTM SA213 JISG3467-88 JISG3458-88 |
Ø8-1240*1-200 | For high-temperature, low-temperature, and corrosion-resistant seamless steel pipes used in petroleum, chemical, power, and boiler industries. |
| Stainless Steel Pipe |
0Cr18Ni9<304> 00Cr19Ni10<304L> 00Cr25Ni20<310S> 0Cr17Ni12Mo2<316> 00Cr17Ni14Mo2<316L> 1Cr18Ni9Ti<321> 0Cr18Ni10Ti 0Cr18Ni11Nb<347> |
GB/T14975-2002 GB/T14976-2002 GB13296-2007 ASTM A213 ASTM A269 ASTM A312 JIS G3459 DIN 17458 |
Ø6-630*0.5-60 | For petroleum, aviation, smelting, food, water conservancy, power, chemical, chemical fiber, and pharmaceutical machinery industries. |
| Low-Temperature Pipe |
16MnDG, 10MnDG, 09DG 09Mn2VDG, 06Ni3MoDG ASTM A333Grade1 ASTM A333Grade3 ASTM A333Grade4 ASTM A333Grade6 ASTM A333Grade7 ASTM A333Grade8 ASTM A333Grade9 ASTM A333Grade10 ASTM A333Grade11 |
GB/T18984-2003 ASTM A333 |
Ø8-1240*1-200 | For seamless steel pipes used in low-temperature pressure vessels and heat exchanger pipes at temperatures ranging from -45°C to -195°C. |
| High-Pressure Boiler Pipe |
20G ASTM SA106B/C ASTM SA210A/C ST45.8-III |
GB5310-1995 ASTM SA106 ASTM SA210 DIN17175-79 |
Ø8-1240*1-200 | For manufacturing heat-receiving tubes, headers, and steam pipes in high-pressure boilers. |
| High-Pressure Fertilizer Pipe |
10 20 16Mn |
GB6479-2000 | Ø8-1240*1-200 | For chemical equipment and pipelines operating at temperatures of -40°C to 400°C and pressures of 10-32 MPa. |
| Petroleum Cracking Pipe |
10 20 |
GB9948-2006 | Ø8-630*1-60 | For furnace tubes, heat exchanger tubes, and pipelines in petroleum refineries. |
| Low-Medium Pressure Boiler Pipe |
10# 20# 16Mn |
GB3087-2008 | Ø8-1240*1-200 | For manufacturing various structures of low-pressure and medium-pressure boilers and locomotive boilers. |
| Fluid Conveying Pipe |
10#, 20# ASTM A106A,B,C, A53A,B 16Mn |
GB/T8163-2008 ASTM A106 ASTM A53 |
Ø8-1240*1-200 | For general seamless steel pipes used in fluid conveying. |
| General Structural Pipe |
10#, 20#, 45#, 27SiMn ASTM A53A,B 16Mn |
GB/T8162-2008 GB/T17396-1998 ASTM A53 |
Ø8-1240*1-200 | For general structures, engineering supports, and mechanical processing. |
| Petroleum Casing |
J55, K55, N80, L80 C90, C95, P110 |
API SPEC 5CT ISO11960 |
Ø60.23-508.00 *4.24-16.13 | For oil extraction in oil wells and as casing for oil and gas wells. |
| Pipeline Pipe |
A, B, X42, X46, X52, X56, X60, X65, X70, X80 L245, L290, L360, L415, L450 |
API SPEC 5L GB/T9711.1 GB/T9711.2 |
Ø32-1240*3-100 | For oxygen, water, and oil conveying pipes in the petroleum and natural gas industry. |
| Welded Pipe |
20, Q195, Q215A,B Q235A,B, Q345A,B,C,D,E |
GB/T13793-1992 GB3091-2001 |
Ø32-630*1-30 | For general structural supports and low-pressure fluid conveying. |
| Spiral Pipe | Q235A-B, Q345A-E | SY/T5037-2000 | 219-2820*4-20 | For low-pressure fluid conveying pipes. |
