Yuhong Group Co.,Ltd
| Payment Terms | L/C, T/T |
| Delivery Time | 20 days |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap etc. |
| Standard | ASTM A789 |
| Grade | UNS S31803 |
| Seamless pipe & Tube Size | 1/2”to 8" |
| Outer Diameter | 6.0- 630 mm |
| Schedules | 10s, 20, 40s, 40, 60, 80s, 80, 100, 120, 140, 160, XXH |
| NDT Test | HT/UT/ET |
| Application | Boilers, Superheaters and Heat Exchangers |
| High light | UNS S31803 |
| Brand Name | Yuhong |
| Model Number | ASTM A789 UNS S31803 |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | China |
View Detail Information
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Product Specification
| Payment Terms | L/C, T/T | Delivery Time | 20 days |
| Packaging Details | Ply-wooden Case /Iron Case/ Bundle with plastic Cap etc. | Standard | ASTM A789 |
| Grade | UNS S31803 | Seamless pipe & Tube Size | 1/2”to 8" |
| Outer Diameter | 6.0- 630 mm | Schedules | 10s, 20, 40s, 40, 60, 80s, 80, 100, 120, 140, 160, XXH |
| NDT Test | HT/UT/ET | Application | Boilers, Superheaters and Heat Exchangers |
| High light | UNS S31803 | Brand Name | Yuhong |
| Model Number | ASTM A789 UNS S31803 | Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | China | ||
| High Light | Boilers Duplex Stainless Steel Tube ，Duplex Stainless Steel Tube ASTM A789 ，UNS S31803 Duplex Stainless Steel Pipe | ||
ASTM A789 UNS S31803 Duplex Stainless Steel Seamless Tube For Chemical Process Plant
ASME SA789 S31803 stainless steel tubing provides better pitting and crevice corrosion resistance than 316L or 317L austenitic stainless steel in almost all corrosive media. It also has high corrosion and erosion fatigue properties, as well as lower thermal expansion rates and higher thermal conductivity compared to austenitic stainless steels. The advantage of a duplex structure is that it combines the advantages of ferritic alloys, stress corrosion resistance, crack resistance, and high strength with the ease of manufacture and corrosion resistance of austenitic alloys.
Chemical Composition
| Grade | C max | Si max | Mn max | P max | S max | Cr | Ni | Mo | N |
| UNS S32750 | 0.030 | 0.8 | 1.2 | 0.030 | 0.015 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 |
| UNS S31803 | 0.030 | 1.0 | 2.0 | 0.020 | 0.020 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
| UNS S31500 | 0.030 | 1.0 | 1.2-2.0 | 0.030 | 0.030 | 18.0-19.0 | 4.5-5.5 | 2.5-3.5 | 0.05-0.10 |
Physical Properties
| Grade | Y.S.MPa min | T.S.Mpa min | Elongation % | Hardness HRC |
| UNS S32750 | 550 | 800 | 15 | 20 |
| UNS S31803 | 450 | 620 | 25 | 20 |
| UNS S31500 | 440 | 630 | 30 | 20 |
Heat Treatment Requirements
| UNS
Designation | Temperature | Quench |
| S31803 | 1870-2010 °F [1020-1100°C] | Rapid cooling in air or water |
| S32205 | 1870-2010 °F [1020-1100°C] | Rapid cooling in air or water |
| S31500 | 1800-1900 °F [980-1040°C] | Rapid cooling in air or water |
| S32550 | 1900 °F [1040°C] min. | Rapid cooling in air or water |
| S31200 | 1920-2010 °F [1050-1100°C] | Rapid cooling in water |
| S31260 | 1870-2010 °F [1020-1100°C] | Rapid cooling in water |
| S32001 | 1800-1950 °F [982-1066°C] | Rapid cooling in air or water |
| S32304 | 1700-1920 °F [925-1050°C] | Rapid cooling in air or water |
| S32750 | 1880-2060 °F [1025-1125°C] | Rapid cooling in air or water |
| S32760 | 2010-2085 °F [1100-1140°C] | Rapid cooling in air or water |
| S32950 | 1820-1880 °F [990-1025°C] | Rapid cooling in water |
| S32520 | 1975-2050 °F [1080-1120°C] | Rapid cooling in air or water |
Duplex Stainless Steel Pipe Application
S31803 Tubes Ordering Information
Orders for product under this specification should in- clude the following, as required, to describe the desired material adequately:
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9... YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9...
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