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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 |
Seamless Steel Pipe | ||||
Material | ASTMA106AASTMA106B,ASTMA106C,ASTMA179,ASTMA192 ASTMA210 | |||
ASTM A53A,ASTM A53B,ASTMA178C | ||||
10#,20#,45#,Q235,Q345,Q195,Q215,Q345C,Q345A | ||||
ST37,ST37-2,DIN 1629 ST35,DIN 1629 ST45,DIN 17175 ST35.8,DIN 17175DIN 17175 | ||||
16Mn,Q345B,T1,T2,T5,T9,T11,T12,T22,T91,T92,P1,P2,P5,P9, | ||||
P11,P12,P22,P91,P92,15CrMO,Cr5Mo,10CrMo910,12CrMo, | ||||
13CrMo44,30CrMo,A333 GR.1,GR.3,GR.6,GR.7,etc | ||||
Size | Outside Diameter：21.3-609.6mm | |||
Thickness ：1.65mm-59.54mm | ||||
Technique | Cold Rolled/Hot Rolled/cold drwan | |||
Standard | API 5CT, 5L; ASTM, BS, JIS, DIN | |||
Packing | Steel strip packed. Standard Export Seaworthy Package.Suit forall kinds of transport,or as required | |||
Qualification | independent import and export qualifications | |||
Main market | Asia, India, Middle East, America, Europe | |||
Application | Widely used in Structure, Accessorize,Construction,Fluid transportation,machinery parts,the stress parts of the automobile tractor parts and so on | |||
Payment Terms | 30% TT deposit and 70% LC the balance | |||
Delivery time | 8-15days upon receipt of 30% deposit. | |||
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