Alloy 630 steel plate is a martensitic stainless steel alloyed with copper and niobium, which can be precipitation hardened by a simple heat treatment. Solution annealing gives a relatively soft low carbon martensite. Tempering 630 steel plate in the range 480°C – 620°C precipitates an intermetallic compound based on copper, which gives high strength and hardness. Because 630 steel plate the precipitation hardening temperature is relatively low little or no scale is formed, and it is easy to restore the corrosion resistance of the part. The hardening is accompanied by a small distortion.
Chemical Composition
Grade | C | Mn | Si | P | S | Cr | Ni | Cu | Nb+Ta | |
630 | min. max | - 0.07 | - 1 | - 1 | - 0.04 | - 0.030 | 15 17.5 | 3 5 | 3 5 | 0.15 0.45 |
Good resistance to a wide range of corrosive environments; approaching that of Grade 304 stainless steel. Like 304, this grade is subject to pitting and crevice corrosion in warm chloride environments. Grade 630 has been used for boat shafting for fresh water, and in sea water with the addition of cathodic protection.
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