Ss steel 630 plate better known as 17-4, is the most common PH stainless. Type ss steel 630 plate is a martensitic stainless steel that offers superior corrosion resistance. It is magnetic, readily welded, and has good fabricating characteristics, though ss steel 630 plate will lose some toughness at higher temperatures. It is known for its resistance to stress-corrosion cracking, and is used in a wide variety of industries and applications including:
Valves and gears
Oil field equipment
Propeller shafts
Pump shafts
Valve spindles
Aircraft and gas turbines
Nuclear reactors
Paper mills
Chemical processing equipment
In order to be sold as Type 630 Stainless Steel, it must contain a unique chemical composition that includes:
Cr 15-17.5%
Ni 3-5%
Mn 1%
Si 1%
P 0.040%
S 0.03%
Cu 3-5%
Nb+Ta 0.15-0.45%
Chemical composition %
| C | Si | Mn | P | S | Cr | Ni | Cu | Nb |
| 0.07 max. | 1.00 max. | 1.00 max. | 0.040 max. | 0.030 max. | 15.00~17.50 | 3.00~5.00 | 3.00~5.00 | 0.15~0.45 |
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