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Seamless steel pipes are perforated from whole round steel, and steel pipes without welds on the surface are called seamless steel pipes. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, and top pipes.
1. High quality: Seamless steel pipes are produced through an excellent quality management system and have stable chemical composition and good physical properties, ensuring the quality of the pipes.2. High strength: Seamless steel pipes have higher strength because they are not welded, and their tensile strength and compressive strength are much higher than those of welded steel pipes.3. Good corrosion resistance: Seamless steel pipes have a smooth surface and no iron oxide scale. They have a longer service life than welded steel pipes and have better corrosion resistance.4. Precision processing: Seamless steel pipes have smooth inner and outer surfaces, small errors, and high dimensional stability. They are suitable for engineering fields that require high precision, such as aviation, aerospace, nuclear industry, etc.| Grade | Chemical Composition (%) | |||||||
| C | Si | Mn | P | S | Ni | Cr | Other | |
| 201 | ≤0.15 | ≤1.00 | 5.5/7.5 | ≤0.060 | ≤0.030 | 3.5-5.5 | 16.0-18.0 | - |
| 202 | ≤0.15 | ≤1.00 | 7.5/10 | ≤0.060 | ≤0.030 | 4.0-6.0 | 17.0-19.0 | - |
| 304 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.03 | 8.0-11.0 | 18.00-20.00 | - |
| 316 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.03 | 10.00-14.00 | 16.0-18.0 | Mo:2.00-3.00 |
| 316L | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.03 | 10.00-14.00 | 16.0-18.0 | Mo:2.00-3.00 |
| 321 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.03 | 9.00-12.00 | 17.0-19.0 | Ti:5C-0.70 |
| 410 | ≤0.15 | ≤1.00 | ≤1.25 | ≤0.060 | ≤0.030 | ≤0.060 | 11.5-13.5 | - |
| 430 | ≤0.12 | ≤1.00 | ≤1.25 | ≤0.040 | ≤0.03 | - | 16.00-18.00 | - |
| 2205 | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.04 | ≤0.03 | 4.5-6.5 | 21.00-24.00 | Mo: 2.5-3.5, |
| N:0.08-0.2 | ||||||||
| 2507 | ≤0.03 | ≤0.80 | ≤1.20 | ≤0.035 | ≤0.02 | 6.00-8.00 | 24.00-26.00 | Mo: 3.0-5.0, |
| N:0.24-0.32 | ||||||||
| Grade | Mechanieal Performece |
| Hardness | |
| 201 | HB≤241,HRB≤100, HV≤240 |
| 202 | HRB≤195, HV≤218 |
| 304 | HB≤187,HRB≤90,HV≤200 |
| 316 | HB≤187, HRB≤90 HV≤200 |
| 316L | HB≤187, HRB≤90 HV≤200 |
| 321 | HRB≤90, HV≤200 |
| 410 | HB≤183, HRB≤88 HV≤200 |
| 430 | HB≤183, HRB≤88 HV≤200 |
| 2205 | Y.S.≥450Mpa, T.S.≥620Mpa |
| 2507 | δb/MPa:800-1000,δ0.2/MPa:≥550 |
Production Range | Outer Diameter:10-120mm (0.4 inch - 4.7 inch) |
Wall Thickness:1-20mm (0.04 inch - 0.78 inch) | |
Material / Grade | Carbon Steel: GB/T 8162 & 8163 & 3639: 10#, 20#, 35#, 45#, 55#, Q235B, Q235C, CF53, A105 ASTM A519: 1010, 1020, 1026, 1035, 1045, 1050 DIN17121/EN 10297-1, DIN1629/DIN2391/EN 10305-1: C10/CK10, C22/CK22, C35/CK35, C45/CK45, CF53 JIS3441/JIS3444/JIS3445: STKM11A, STKM12A/STKM12B/STKM12C, STKM13A/STKM13B/STKM13C JIS G4051: S10C, S20C, S25C, S35C, S45C, S55C |
Alloy Steel: GB/T 8162 & 8163 & 3639: 16Mn(Q345B), 20Cr, 40Cr, 15CrMo, 20CrMo, 28CrMo, 30CrMo, 35CrMo, 42CrMo, 20CrMnTi, 40MnMoV, 20Mn2, ZF6, 16MnCr5, 20MnCr5, 38Mn2V, 09CrCuSb(ND) ASTM A519: 5120, 5140, 4130, 4135, 4140 DIN17121/EN 10297-1, DIN1629/DIN2391/EN 10305-1: ST52, EN10084-1998 20Cr4, 41Cr4, 15CrMo4, 25CrMo4, 35CrMo4, 42CrMo4, 16MnCr5 JIS3441/JIS3444/JIS3445: SCM432/SCRRM3, SCM4 JIS G4053: JIS SCr420, JIS SCr440, SCM415, SCM420 | |
Tolerance | Tolerance ±0.15mm,Superior products ±0.05mm, Can be customized according to customer's requirements |
Technique | Cold Drawn / Cold Rolled |
Shape | Round |
Further Processing for Steel Tubes | Final Annealing, Cutting, Chamfer, Threading, Inner diameter or Outer Diameter Lathe, Surface Shot Blasting, Laser Marking |
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