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Large diameter seamless steel pipes are mainly produced by hot-rolled large-diameter seamless steel pipes and hot-expanded-diameter seamless steel pipes.
1. The surface of large-diameter steel pipes is more durable and has anti-rust and anti-rust treatment. The oxidation rate will not be too fast and white rust will not form on the square steel pipe.2. It has anti-corrosion and wear-resistant properties, making the seamless steel pipe have a longer service life.3. Seamless steel pipes are protected. After heating, hot-dip galvanizing is performed on each position of the seamless steel pipe, and the convex and concave positions are protected.4. Because the seamless steel pipe is hot-dip galvanized on the outside, it saves the time of painting or brushing, making the construction more convenient.5. Hot-dip galvanized steel pipes will not freeze or break even within 39 days, making them very suitable for northern regions.| 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 |
Product Name | Product specifications of large diameter seamless pipe | |||
Standard | DIN2391, EN10305, ASTM A519, GB/T 3639-200 | |||
Material | 20#, 45#, Q345 27simn 304 316 321 310 2205 | |||
Size | OD: 5-1500mm WT: 0.5-50 Length: 3-9m | |||
Test | Tensile Test, Hydraulic Test, Eddy Current Test etc | |||
Application | hydraulic cylinder, swivel crane, injection machine and so on | |||
Conservation | anti rust oiled inside and outside surface, plastic caps in both ends | |||
Package | bundle with steel strip and knitting strip, or wooden case | |||
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