Yuhong Group Co.,Ltd
| Payment Terms | L/C,T/T |
| Supply Ability | |
| Delivery Time | 7DAYS |
| Packaging Details | Wooden Case |
| Standard | ASTM A403 |
| Material | WP304 |
| NDT | HT/PT/RT |
| Packing | Wooden Case |
| Application | Boiler System/Petrochemical/Electric power/Marine engineering |
| Brand Name | YUHONG |
| Model Number | ASTM A403 WP304 |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C,T/T | Supply Ability | |
| Delivery Time | 7DAYS | Packaging Details | Wooden Case |
| Standard | ASTM A403 | Material | WP304 |
| NDT | HT/PT/RT | Packing | Wooden Case |
| Application | Boiler System/Petrochemical/Electric power/Marine engineering | Brand Name | YUHONG |
| Model Number | ASTM A403 WP304 | Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015 |
| Place of Origin | CHINA | ||
| High Light | ASTM A403 stainless steel elbow ，WP304 90° elbow fitting ，B16.9 stainless steel fitting | ||
ASTM A403 WP304 Stainless Steel Fitting Elbow Buttwelded Seamless B16.9
ASTM A403 WP304 stainless steel fittings are one of the most widely used austenitic stainless steel fittings. The ASTM A403 standard specifies strict requirements for chemical composition, mechanical properties, heat treatment, dimensional tolerances, non-destructive testing and marking for wrought butt-weld, socket-weld and threaded fittings manufactured from UNS S30400.
| Class | Construction | Nondestructive Examination |
|---|---|---|
| S | Seamless | None |
| W | Welded | Radiography or Ultrasonic |
| WX | Welded | Radiography |
| WU | Welded | Ultrasonic |
ASTM A403 WP304 Stainless Steel Chemical Composition
| WP GRA. | UNS GRA. | CHEMICAL COMPOSITION % | ||||||
|---|---|---|---|---|---|---|---|---|
| C | MN | P | S | Si | NI | Cr | ||
| WP304 | S30400 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-11.0 | 18.0-20.0 |
| WP304L | S30406 | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-12.0 | 18.0-20.0 |
What is the difference between WP304 and WP304L?
The core difference between WP304 and WP304L lies in their carbon content. WP304 has a standard upper limit of 0.08%, while WP304L has a strictly limited upper limit of 0.030%. The "L" stands for Low Carbon, an ultra-low carbon version of 304 stainless steel. This difference in carbon content primarily affects the intergranular corrosion resistance and weldability of WP304 and WP304L.
Intergranular corrosion occurs when 304 stainless steel is exposed to the sensitive temperature range of 425°C to 850°C. Carbon combines with chromium to form chromium carbides, which precipitate at grain boundaries. This significantly reduces the chromium content near the grain boundaries, creating "chromium depletion." Corrosive media preferentially attack these depleted areas, leading to cracking along the grain boundaries.
This makes WP304 highly carbon-sensitive, while the ultra-low carbon design of WP304L can significantly reduce the amount of chromium carbide precipitation. At the same time, without the need for post-weld heat treatment, WP304L still maintains excellent intergranular corrosion resistance, thus eliminating the need for post-weld heat treatment and significantly saving cost and time.
ASTM A403 WP304 Stainless Steel Fitting Heat Treatment
| WP GRA. | Solution Anneal Temperature, min °F [°C]B | Quench |
|---|---|---|
| WP304 | 1900 [1040] | water or other rapid cool |
ASTM A403 WP304 Stainless Steel Fitting Tensile Requirements
| WP GRA. | Yield Strength, min, ksi [MPa] | Tensile Strength, min, ksi [MPa] |
|---|---|---|
| WP304 | 30[205] | 75[515] |
ASTM A403 WP304L Stainless Steel Fitting Application
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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