The alloy stainless steel 630 plate is readily welded, formed and forged. Machining is carried out in the solution annealed condition and then precipitation hardened. As stainless steel 630 plate the hardening takes place over a range of temperatures, stainless steel 630 plate is possible to vary the strength and ductility to achieve a range of mechanical properties.
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 |
Highly resistant to stress corrosion cracking if aged at 550°C or higher. Higher aging temperatures give better SCC resistance. Grade 630 is resistant to sulphide stress cracking (SSC) if highly aged; NACE MR0175 permits the use of 630 but only in a double age hardened condition (refer to MR0175 and ASTM A564M).
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