Torich International Limited
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Product Name:TORICH GB/T18704 Q195 Q235 12Cr18Ni9 Stainless Steel Clad Pipes for Structural Purposes
Standard: GB/T18704
OD: 12.7 - 325 mm
WT: 0.8 - 12 mm
Length: 1-8m or according to customers' actual application and production.
Application:public facilities. Vehicle and ship manufacturing. Road guardrail. Furniture. Medical apparatus and instruments
Steel Grade:Q195 Q235 06Cr19Ni10 12Cr18Ni9 12Cr18Mn9Ni5N 12Cr17Mn6Ni5N
Technology: Continuous welding molding
Tolerance of OD
| Surface delivery condition | Nominal outside diameter | Tolerance |
| Polishing,Polish (SB,SP) | ≤25 | ±0.25 |
| ＞25~40 | ±0.30 | |
| ＞40~50 | ±0.35 | |
| ＞50~60 | ±0.40 | |
| ＞60~70 | ±0.50 | |
| ＞70~80 | ±0.60 | |
| ＞80 | ±1％D | |
| Unpolished,Sand blasting(SNB,SS) | ≤25 | ±0.30 |
| ＞25~50 | ±0.40 | |
| ＞50 | ±1.0％D |
Tolerance of WT
| Wall thickness(S) | Tolerance(high-grade) | Tolerance(medium grade) |
| ≥0.8~2.0 | ±0.10 | ±0.20 |
| ＞2.0~3.0 | ±0.15 | ±0.30 |
| ＞3.0 | ±5％S | ±10％S |
Chemical composition
| No. | Unified digital code | New steel grade | Old steel grade | Chemical composition | |||||||
| C | Si | Mn | P | S | Ni | Cr | N | ||||
| 1 | S35350 | 12Cr17Mn6Ni5N | 1Cr17Mn6Ni5N | ≤0.15 | ≤1.00 | 5.50~7.50 | ≤0.050 | ≤0.030 | 3.50~5.50 | 16.00~18.00 | 0.05~0.25 |
| 2 | S35450 | 12Cr18Mn9Ni5N | 1Cr18Mn8Ni5N | ≤0.15 | ≤1.00 | 7.50~10.0 | ≤0.050 | ≤0.030 | 4.00~6.00 | 17.00~19.00 | 0.05~0.25 |
| 3 | S30210 | 12Cr18Ni9 | 1Cr18Ni9 | ≤0.15 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 8.00~10.00 | 17.00~19.00 | ≤0.10 |
| 4 | S30408 | 06Cr19Ni10 | 0Cr18Ni9 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 8.00~11.00 | 18.00~20.00 | - |
Mechanical property
| No. | Unified digital code | New steel grade | Old steel grade | Yield strength Rp0.2/MPa | Tensile Strength Rm/MPa | Elongation A/ ％ |
| ≥ | ||||||
| 1 | S35350 | 12Cr17MnNi5N | 1Cr17Mn6Ni5N | 245 | 520 | 25 |
| 2 | S35450 | 12Cr18Mn9Ni5N | 1Cr18Mn8Ni5N | 245 | 520 | |
| 3 | S30210 | 12Cr18Ni9 | 1Cr18Ni9 | 210 | 520 | 30 |
| 4 | S30408 | 06Cr19Ni10 | 0Cr18Ni9 | 210 | 520 | |
1~ Incoming Raw Material Inspection
2~ Raw Material Segregation to avoid steel grade mix-up
3~ Heating and Hammering End for Cold Drawing
4~ Cold Drawing and Cold Rolling, on line inspection
5~ Heat Treatment, +A, +SRA, +LC, +N, Q+T
6~ Straightening-Cutting to specified length-Finished Measuring Inspection
7~ Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8~ Packing and Stocking.
100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects.
