Duplex stainless steel is a kind of stainless steel material. They are called biphasic (or austenite-ferrite) because their metallurgical structure consists of two phases, with almost equal proportions of austenite and ferrite. These materials have improved corrosion resistance, particularly chloride stress corrosion and chloride pitting, and have higher strength than standard austenitic stainless steels such as SS304 or SS316. Compared with austenitic stainless steel, the main difference in composition of duplex steel is the chromium content of 20-28% higher; Molybdenum content is high, up to 5%; The nickel content was reduced to 9% and the nitrogen content was reduced to 0.05-0.50%. Both low nickel content and high strength are significantly cost effective.
| Product Name | Stainless Steel Seamless Pipe |
| Material | 200 series:201,202 |
| 300 series:304,304L,321,316,316L,316Ti, 347H,309S,310S |
| 400 series: 410,420,430,440 |
| 900 series: 904,904L |
| Duplex 2205,2507 |
| Special:2507,316Ti,316LN,347H.317L,310S,253MA,RA330,725LN,724L etc. |
| Standard | AISI,ASTM,BS,DIN,EN,GB,ISO,JIS etc. |
| Size | 10*1-2,12*1-3..202-5,222-630"2.5-8,32"2.5-8..40*3-12,42*3-12...All the way to 508*8-85,53018-85..610*8-90,630*8-90...820*10-95mm Please inform us of other specifications in detail. |
| Length | No Fixed Length |
| Tolerance | According to Standard |
| Surface | NO.1,2D,2B,NO.4,HL，BA,8Ketc. |
| Applications | Heat Exchanger,Ferilization,Chemical and Petrochemical,Power Generation and Environmental Technologies,Ship-building.Pipeline for Petroleum,Water,Gas and other common Fluid,Mechanical and Plant Engineering and Construction, Automotive,Pipeline for High Temperature and Pressure Service |
| Quality Management | ISO9001,CE,Third Party Testing / Inspection,Certifications Applied for Buyers' Countries |
| Samples | Kindly Discuss with Sales Assistant |
| Lead Time | Depends on Specifications,Quantity etc. |
| Package | Standard Seaworthy Package or as Required |
| Price Term | CIF CFRFOBEx-WORK |
| Payment Method | T/T, LC etc. |
Chemical composition：
| S32750 | C | Mn | P | S | Si | Cr | Ni | N | Mo |
| Requirements% | ≤0.03 | 1.2 | ≤0.03 | ≤0.02 | ≤0.8 | 24-26 | 6.0-8.0 | 0.24-0.32 | 3.0-5.0 |
Corresponding table of product brand：
| DIN | EN | ASTMAISl | UNS | GB |
| 1.431 | x10CrNi18-8 | 301 |
|
|
| 1.4318 | X2CNiN18-7 | 301LN |
|
|
| 1.4307 | x2CNi18-9 | 304L | S30403 |
|
| 1.4306 | x2CINi19-11 | 304L | S30403 | 0OCr18Ni9 |
| 1.4311 | x2CrNiN18-10 | 304LN | S30453 |
|
| 1.4301 | X5CrNi18-10 | 304 | S30400 | 06Cr19Ni10(GB/T3280-2007) |
| 1.4948 | X6CrN18-11 | 304H | S30409 |
|
| 1.4303 | x5CrNi18-12 | 305 |
|
|
| 1.4541 | x6CrNiT18-10 | 321 | S32100 | 0Cr18Ni11Ti |
| 1.4878 | x12CrNiTi18-9 | 321H | S32109 |
|
| 1.4404 | x2CrNiMo17-12-2 | 316L | S31603 | 00Cr17Ni14Mo2 |
| 1.4432 | x2CrNiMo17-12-3 | 316L | S31603 | 00Cr17Ni14Mo2 |
| 1.4435 | x2CrNiMo18-14-3 | 316L | S31603 | 00Cr17Ni14Mo2 |
| 1.4401 | X5CrNiMo17-12-2 | 316 | S31600 | 0Cr17Ni12Mo2 |
| 1.4436 | x3CrNiMo17-13-3 | 316 | S31600 | 0Cr17Ni12Mo2 |
| 1.4406 | x2CtNiMoN17-12-2 | 316LN | S31653 |
|
| 1.4571 | x6CrNiMoTi17-12-2 | 316Ti | S31635 |
|
| 1.4429 | x2CrNiMoN17-13-3 | 316LN | S31653 |
|
| 1.4438 | ×2CrNiMo18-15-4 | 317L | S31703 |
|
| x10CrNiTi18-9 | 347 |
| 0Cr18Ni11Nb |
| 1.4512 | x6CrTi12 | 409 |
| 0Cr11Ti |
|
|
| SS41000 | oCr13 |
|
| 410 |
| 1Cr13 |
|
| 4201 |
| 2Cr13 |
| 1.4016 | x6Cr17 | 430 |
| 1Cr17 |
| 1.4118 | x40CrMo15 | 440A | S44002 | 8Cr13 |
| 1.4112 |
| 440B | S44004 | 9Cr13 |
| 1.4125 |
| 440C | S44003 | 11Cr18 |
|
| 440F | S44020 |
|
| 1.4539 | 1NiCrMoCu25-20-5 | 904L | N08904 | 00Cr20Ni25Mo4.5Cu |
| 1.4547 | X1CrNiMoCuN20-18-7 |
| S31254 |
|
Surface classification：
| Surface | Characteristic | Processing Technology |
| N0.1 | Original | Pickled after hot rolling |
| 2D | Blunt | Hot rolling + annealing shot peening pickling + cold rolling + annealing pickling |
| 2B | Blurred | Hot rolling + annealing shot peening pickling + cold rolling + annealing pickling + tempering rolling |
| N0.3 | Matte | Polishing and tempering rolling with 100-120 mesh abrasive materials |
| N0.4 | Matte | Polishing and tempering rolling with 150-180 mesh abrasive material |
| NO.240 | Matte | Polishing and tempering rolling with 240 mesh abrasive materials |
| NO.320 | Matte | Polishing and tempering rolling with 320 mesh abrasive materials |
| NO.400 | Matte | Polishing and tempering rolling with 400 mesh abrasive materials |
| HL | Brushed | Grind the surface of the steel belt with an appropriate grinding grain size to make it show a certain longitudinal texture |
| BA | Bright | The surface is annealed and shows high reflectivity |
| 6K | Mirror | Rough grinding and polishing |
| 8K | Mirror | Fine grinding and polishing |
