What are ASTM A403 WP321 pipe fittings?
ASTM A403 WP321 pipe fittings mean the pipe fitting which material is Wrought Austenitic Stainless,they are used for the pressure piping systems of moderate and high temperature services.ASTM A403 is the standard of pipe fittings material,it indicates the materials properties of different kinds of stainless steel,WP321 is one of the steel grade in this standard. Ti as a stabilizing element exists in 321 stainless steel,it is better than 316L in terms of high temperature.321 stainless steel has good abrasion resistance in organic acid and inorganic acid with different concentration and temperature,especially has good abrasion resistance in oxidizing medium.It is always used in the manufacture of wear resistant acid containers and pipeline equipment.ASTM A403 WP321 is one of the most common stainless steel pipe fittings material.(ASTM A403 WP321 Standard Specification)
ASTM A403 WP321 pipe fittings are butt welding ends,commonly used to be welded with the steel pipes of A213,A49,GR.B material or API 5L GR.B material.
Chemical Composition (%) of ASTM A403 WP321
| Grade | C | Mn | P | S | Si |
| WP321 | ≤0.08 | ≤2.00 | 0.045 | 0.03 | ≤1.00 |
| Grade | Cr | Ti | Ni | ||
| WP321 | 17.00-19.00 | ≧5*C% | 9.00-12.00 |
Type of the ASTM A403 WP321 steel pipe fittings:
The regular products of A403 WP321 pipe fittings are elbows,tees,reducers,caps,cross.There are seamless and ERW A403 WP321 pipe fittings,the seamless A403 WP321 pipe fittings means the fittings are made from the seamless steel pipes,ERW means the fittings are made from ERW steel pipes.Welded A403 WP321 pipe fittings mean the large sizes fittings which are pieces welded from steel plates.
Manufacturing process of ASTM A403 WP321 steel pipe fittings:
The process of A403 WP321 pipe fittings manufacturing is called “wrought” which means it could be casted or forged. Usually the ASTM A403 WP321 elbows,tees,reducers are made from steel pipes, the caps are made from plates.But the large sizes pipe fittings are commonly manufactured in pieces and welded together.
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