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TORICH GB/T 14975 Seamless Stainless Steel Tubes For Structure
Table 1 The Tolerance of Nominal Outer Diameter and Wall Thickness Unit:mm
| Hot Roll(Extrusion,Expansion)Steel Tube | Cold Drawn(Roll) Steel Tube | ||||||
| Diamension | Tolerance | Diamension | Tolerance | ||||
| Ordinary Level PA | High Level PC | Ordinary Level PA | High Level PC | ||||
Nominal Outer Diameter D | ＜76.1 | ±1.25%D | ±0.60 | Nominal Outer Diameter D | ＜12.7 | ±0.30 | ±0.10 |
| 76.1~＜139.7 | ±0.80 | 12.7~＜38.1 | ±0.30 | ±0.15 | |||
| 139.7~＜273.1 | ±1.5%D | ±1.20 | 38.1~＜88.9 | ±0.40 | ±0.30 | ||
| 88.9~＜139.7 | ±0.9%D | ±0.40 | |||||
| 273.1~＜323.9 | ±1.60 | 139.7~＜203.2 | ±0.80 | ||||
| 203.2~＜219.1 | ±1.10 | ||||||
| ≥323.9 | ±0.6%D | 219.1~＜323.9 | ±1.60 | ||||
| ≥323.9 | ±0.5%D | ||||||
Nominal Wall Thinckness S | All Wall Thickness | +15%S -12.52%S | ±12.5%S | Nominal Wall Thinckness S | All Wall Thickness | +12.5%S -10%S | ±10%S |
Table 2 Tolerance of Minimum Wall Thickness Unit:mm
| Production Method | Diamension | Tolerance | |
| Ordinary Level PA | High Level PC | ||
Hot Roll(Extrusion,Expansion)Steel Tube W-H | Smin＜15 | +27.5% Smin 0 | +25% Smin 0
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| Smin≥15 | +35% Smin 0 | ||
Cold Drawn(Roll) Steel Tube W-C | All Wall Thickness | +22% S 0 | +20% S 0 |
Table 3 Grade and Chemical Component
| No. | Unified Digital Code | Grade | Chemical Component(Quality Fraction)/% | |||||||||
| C | Si | Mn | P | S | Ni | Cr | Mo | Cu | N | |||
| 1 | S30210 | 12Cr18Ni9 | 0.15 | 1.00 | 2.00 | 0.040 | 0.030 | 8.00~10.00 | 17.00~19.00 | - | - | 0.10 |
| 2 | S30408 | 06Cr19Ni10 | 0.08 | 1.00 | 2.00 | 0.040 | 0.030 | 8.00~11.00 | 18.00~20.00 | - | - | - |
| 3 | S30403 | 022Cr19Ni10 | 0.030 | 1.00 | 2.00 | 0.040 | 0.030 | 8.00~12.00 | 18.00~20.00 | - | - | - |
| 4 | S30458 | 06Cr19Ni10N | 0.08 | 1.00 | 2.00 | 0.040 | 0.030 | 8.00~11.00 | 18.00~20.00 | - | - | 0.10~0.16 |
| 5 | S30478 | 06Cr19Ni9NbN | 0.08 | 1.00 | 2.50 | 0.040 | 0.030 | 7.50~10.50 | 18.00~20.00 | - | - | 0.15~0.30 |
| 6 | S30453 | 022Cr19Ni10N | 0.030 | 1.00 | 2.00 | 0.040 | 0.030 | 8.00~11.00 | 18.00~20.00 | - | - | 0.10~0.16 |
| 7 | S30908 | 06Cr23Ni13 | 0.08 | 1.00 | 2.00 | 0.040 | 0.030 | 12.00~15.00 | 22.00~24.00 | - | - | - |
| 8 | S31008 | 06Cr25Ni20 | 0.08 | 1.50 | 2.00 | 0.040 | 0.030 | 19.00~22.00 | 24.00~26.00 | - | - | - |
| 9 | S31252 | 015Cr20Ni18Mo6CuN | 0.02 | 0.80 | 1.00 | 0.030 | 0.010 | 17.50~18.50 | 19.50~20.50 | 6.00~6.50 | 0.50~1.00 | 0.18~0.22 |
| 10 | S31608 | 06Cr17Ni12Mo2 | 0.08 | 1.00 | 2.00 | 0.040 | 0.030 | 10.00~14.00 | 16.00~18.00 | 2.00~3.00 | - | - |
| 11 | S31603 | 022Cr17Ni12Mo2 | 0.030 | 1.00 | 2.00 | 0.040 | 0.030 | 10.00~14.00 | 16.00~18.00 | 2.00~3.00 | - | - |
Table 4 Mechnical Properties
| No. | Serial number | Steel Grade | Mechnical Properties | Hardness | ||
tensile strength Rm/MPa | elongation strength Rp0.2/MPa | elongation after fracture A/％ | HBW/HV/HRB | |||
| ≥ | ≤ | |||||
| 1 | S30210 | 12Cr18Ni9 | 520 | 205 | 35 | 192HbW/200HV/90HRB |
| 2 | S30438 | 06Cr19Ni10 | 520 | 205 | 35 | 192HbW/200HV/90HRB |
| 3 | S30403 | 022Cr19Ni10 | 480 | 175 | 35 | 192HbW/200HV/90HRB |
| 4 | S30458 | 06Cr19Ni10N | 550 | 275 | 35 | 192HbW/200HV/90HRB |
| 5 | S30478 | 06Cr19Ni9NbN | 685 | 345 | 35 | - |
| 6 | S30453 | 022Cr19Ni10N | 550 | 245 | 40 | 192HbW/200HV/90HRB |
| 7 | S30908 | 06Cr23Ni13 | 520 | 205 | 40 | 192HbW/200HV/90HRB |
| 8 | S31008 | 06Cr25Ni20 | 520 | 205 | 40 | 192HbW/200HV/90HRB |
| 9 | S31252 | 015Cr20Ni18Mo6CuN | 655 | 310 | 35 | 220HbW/230HV/96HRB |
| 10 | S31608 | 06Cr17Ni12Mo2 | 520 | 205 | 35 | 192HbW/200HV/90HRB |
| 11 | S31603 | 022Cr17Ni12Mo2 | 480 | 175 | 35 | 192HbW/200HV/90HRB |
| 12 | S31609 | 07Cr17Ni12Mo2Ti | 515 | 205 | 35 | 192HbW/200HV/90HRB |
| 13 | S31668 | 06Cr17Ni12Mo2N | 530 | 205 | 35 | 192HbW/200HV/90HRB |
| 14 | S31653 | 022Cr17Ni12Mo2N | 550 | 245 | 40 | 192HbW/200HV/90HRB |
| 15 | S31658 | 06Cr17Ni12Mo2N | 550 | 275 | 35 | 192HbW/200HV/90HRB |
| 16 | S31688 | 06Cr18Ni12Mo2Cu2 | 520 | 205 | 35 | - |
| 17 | S31683 | 022Cr18Ni14Mo2Cu2 | 480 | 180 | 35 | - |
| 18 | S31782 | 015Cr21Ni26Mo5Cu2 | 490 | 215 | 35 | 192HbW/200HV/90HRB |
Table 5 Testing items and sampling quantity of steel tubes
| Number | Testing items | Sampling quantity |
| 1 | Chemical composition | 1 sample from each furnace |
| 2 | Tensile test | 1 sample from each of two steel tubes on each batch |
| 3 | Hardness test | 1 sample from each of two steel tubes on each batch |
| 4 | Ultrasonic testing | ALL |
| 5 | Hydraulic test | ALL |
