What are ASTM A403 WP321H pipe fittings?
ASTM A403 WP321H pipe fittings mean the pipe fittings which material is wrought austenitic stainless,grade A403 WP321H,they are used for the pressure piping systems of moderate and high temperature services.WP321H is one of the steel grade in A403 standard.Ti as a stabilizing element exists in 321H stainless steel,the H means the element Carbon content is higher than common 321 material.It is better than 321 in terms of high temperature.321H 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 WP321H is the most common stainless steel pipe fittings material.(ASTM A403 WP321H Standard Specification)
ASTM A403 WP321H 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 WP321H
| Grade | C | Mn | P | S | Si |
| WP321H | 0.04-0.10 | ≤2.00 | ≤0.045 | 0.03 | ≤0.75 |
| Grade | Cr | Ti | Ni | ||
| WP321H | 17.00-19.00 | 4*(C+N)-0.7 | 9.00-12.00 |
Type of the ASTM A403 WP321H pipe fittings:
The regular products of A403 WP321H pipe fittings are elbows,tees,reducers,caps,cross.There are seamless and ERW A403 WP321H pipe fittings,the seamless A403 WP321H pipe fittings means the fittings are made from the seamless steel pipes,ERW means the fittings are made from ERW steel pipes.Welded A403 WP321H pipe fittings mean the large sizes fittings which are pieces welded from steel plates.
Manufacturing process of ASTM A403 WP321H pipe fittings:
The process of A403 WP321H pipe fittings manufacturing is called “wrought” which means it could be casted or forge. Usually the ASTM A403 WP321H 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.
Hebei Haihao Group has more than 30 years experiences in ASTM A403 WP321H pipe fittings manufacturing,we can supply all the range of the fittings including the elbows,tees,reducers,and caps of high quality , soon delivery.