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| Brand Name: | TORICH |
| Model Number: | GB/T 12770 |
| MOQ: | 0.5 Ton |
| Price: | negotiable |
| Payment Terms: | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability: | 10000 Ton/Year |
TORICH 321 302 310S Stainless Steel Welded Steel Tube for Mechanical Structure GB/T 12770
SPEC:
Material:304/304L 316/316L 321 302 310S
Size Range:OD:4-1200mm
WT:0.3-200mm
General Length:2-12m
Tolerance:
According to the following tables or customers’ request.
Table1Tolerance of OD
| Classification | Nominal OD | Permissible Tolerance | ||
| PC | PB | PA | ||
| H T | ＜25 | ±0.20 | ±0.15 | ±0.10 |
| ≥25~＜40 | ±0.30 | ±0.25 | ±0.20 | |
| ≥40~＜63 | ±0.50 | ±0.30 | ±0.25 | |
| ≥63~＜90 | ±0.60 | ±0.50 | ±0.40 | |
| ≥90~＜159 | ±0.80 | ±0.65 | ±0.50 | |
| ≥159~＜300 | ±0.8%D | ±0.7%D | ±0.5%D | |
| ≥300~＜610 | ±0.1%D | ±0.8%D | ±0.6%D | |
| ≥10 | protocol | protocol | protocol | |
| WC SP | ＜25 | ±0.15 | ±0.12 | ±0.10 |
| ≥25~＜40 | ±0.20 | ±0.15 | ±0.13 | |
| ≥40~＜50 | ±0.20 | ±0.18 | ±0.15 | |
| ≥50~＜60 | ±0.25 | ±0.20 | ±0.18 | |
| ≥60~＜90 | ±0.30 | ±0.28 | ±0.25 | |
| ≥90~＜100 | ±0.40 | ±0.35 | ±0.30 | |
| ≥100~＜200 | ±0.5%D | ±0.4%D | protocol | |
| ≥200 | protocol | protocol | protocol | |
Table 2Tolerance of WT
| Nominal WT | Permissible Tolerance |
| ＜0.5 | ±0..10 |
| ≥0.5~1.0 | ±0.15 |
| ＞1.0~2.0 | ±0.20 |
| ＞2.0~＜4.0 | ±0.30 |
| ≥4.0 | ±10%S |
Table 3 Bending Degree
| Nominal Wall Thickness/mm | Bending Degree/(mm/m) |
| ≤108 | ≤1.0 |
| ＞108~325 | ≤1.5 |
| ＞325 | ≤2.5 |
Table4 The density of the steel and Calculation of Theoretic Weight
| No. | Steel Grade | Density/(kg/dm3) | The formula after conversion |
| 1 | 12Cr18Ni9 | 7.93 | W=0.02491S(D-S) |
| 2 | 06Cr19Ni10 | ||
| 3 | 022Cr19Ni10 | 7.90 | W=0.02482S(D-S) |
| 4 | 06Cr25Ni20 | 7.98 | W=0.02507S(D-S) |
| 5 | 06Cr17Ni12Mo2 | 8.00 | W=0.02513S(D-S) |
| 6 | 022Cr17Ni12Mo2 | ||
| 7 | 06Cr18Ni11Ti | 8.03 | W=0.02523S(D-S) |
| 8 | 06Cr18Ni11Nb | ||
| 9 | 022Cr22Ni5Mo3N | 7.80 | W=0.02450S(D-S) |
| 10 | 022Cr23Ni5Mo3N | ||
| 11 | 022Cr25Ni7Mo4N | ||
| 12 | 022Cr18Ti | 7.70 | W=0.02491S(D-S) |
| 13 | 019Cr19Mo2NbTi | 7.75 | W=0.02435S(D-S) |
| 14 | 06Cr13Al | ||
| 15 | 022Cr11Ti | ||
| 16 | 022Cr12Ni | ||
| 17 | 06Cr13 |
Table A.1 Comparison table of stainless steel brands in each standard
| Number | GB/T 20878-2007 | ASTM A 959-09 | JIS G 4303-2005 JIS G 4311-1991 | ISO/TS 15510: 2003 ISO 4955: 2005 | EN10088: 1-2005 | ROCT 5632-1972 | |||
| Number | Unified digital code | New Brand | Old Brand | ||||||
| 1 | 13 | S30210 | 12Cr18Ni9 | 1Cr18Ni9 | S30200,302 | SUS302 | X10CrNi18-8 | X10CrNi18-8,1.4310 | 12X18H9 |
| 2 | 17 | S30408 | 06Cr19Ni10 | 0Cr18Ni9 | S30400,304 | SUS304 | X5CrNi18-10 | X5CrNi18-10,1.4301 | -- |
| 3 | 18 | S30403 | 022Cr19Ni10 | 00Cr19Ni10 | S30403,304L | SUS304L | X2CrNi19-11 | X2CrNi19-11,1.4306 | 03X18H11 |
| 4 | 35 | S31008 | 06Cr25Ni20 | 0Cr25Ni20 | S31008,310S | SUS310S | X12CrNi23-12 | X12CrNi23-12,1.4845 | 10X23H18 |
| 5 | 38 | S31608 | 06Cr17Ni12Mo2 | 0Cr17Ni12Mo2 | S31600,316 | SUS316 | X5CrNiMo17-12-2 | X5CrNiMo17-12-2,1.4401 | -- |
| 6 | 39 | S31603 | 022Cr17Ni12Mo2 | 00Cr17Ni14Mo2 | S31603,316L | SUS316L | X2CrNiMo17-12-2 | X2CrNiMo17-12-2,1.4404 | 03X17H14M2 |
| 7 | 55 | S32168 | 06Cr18Ni11Ti | 0Cr18Ni10Ti | S32100,321 | SUS321 | X6CrNiTi18-10 | X6CrNiTi18-10,1.4541 | 08X18H10T |
| 8 | 62 | S34778 | 06Cr18Ni11Nb | 0Cr18Ni11Nb | S34700,347 | SUS347 | X6CrNiNb18-10 | X6CrNiNb18-10,1.4550 | 08X18H12B |
| 9 | 70 | S22253 | 022Cr22Ni5Mo3N | 00Cr22Ni5Mo3N | S31803 | SUS329J3L | X2CrNiMoN22-5-3 | X2CrNiMoN22-5-3,1.4462 | -- |
| 10 | 71 | S22053 | 022Cr23Ni5Mo3N | 00Cr22Ni5Mo3N | S32205,2205 | -- | -- | -- | -- |
| 11 | 76 | S25073 | 022Cr25Ni7Mo4N | 00Cr25Ni7Mo4N | S32750,2507 | -- | X2CrNiMoN25-7-4 | X2CrNiMoN25-7-4,1.4410 | -- |
| 12 | 87 | S11863 | 022Cr18Ti | 00Cr17 | S43035,439 | X3CrTi17 | X3CrTi17,1.4510 | 08X17T | |
| 13 | 92 | S11972 | 019Cr19Mo2NbTi | 00Cr18Mo2 | S44400,444 | X2CrMoTi18-2 | X2CrMoTi18-2,1.4521 | -- | |
| 14 | 78 | S11348 | 06Cr13Al | 00Cr13Al | S40500,405 | SUS405 | X6CrAl13 | X6CrAl13,1.4002 | -- |
| 15 | 80 | S11163 | 022Cr11Ti | 00Cr12Ti | S40900 | X2CrTi12 | X2CrTi12,1.4512 | -- | |
| 16 | 82 | S11213 | 022Cr12Ni | 00Cr12Ni | S40977 | -- | X2CrNi12 | X2CrNi12,1.4003 | -- |
| 17 | 97 | S41008 | 06Cr13 | 0Cr13 | S41008,410S | X6Cr13 | X6Cr13,1.4000 | 08X13 | |
Characteristic:
Good concentricity
Good surface quality
Good OD and ID tolerance
High Precision
Stable quality
Smooth Roughness
TORICH QUALITY ASSURANCE
Processing:Single-sided automatic arc welding or Double-sided automatic arc welding
Technical Delivery Conditions:Heat treatment+pickling or NBK
Widely used in the field of:Construction & Decoration
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.
Product Images:
FAQ
Q: Are you trading company or manufacturer ?
A: A professional steel pipes materials inventor, manufacturer and solution provider
Q: How long is your delivery time?
A: Generally it is 7-14 days if the goods are in stock. or it is 30-60 days if the goods are not in stock, and it is according to quantity.
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A: Yes, we could offer the sample for free charge but you need to pay the cost of freight.
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A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance , balance before shippment.
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