BÖHLER N700 covers a corrosion-resistant steel in the form of bars, wire, forgings in the solution heat treated condition.
It is a martensitic precipitation hardenable chromium-nickel-copper steel possessing high strength and toughness. Further strength increments can be obtained by cold forming, followed by a precipitation hardening treatment.
These products have been used typically for parts requiring corrosion resistance and high strength up to 600 °F (316 °C), but usage is not limited to such applications. However, use is not limited to such applications. Improved corrosion resistance compared to the 13% or 17% chromium steels. Remelting processes are used to improve steel purity and homogeneity. (ESR, PESR, VAR)
Certain processing procedures and service conditions may cause these products to become subject to stress-corrosion cracking.
For applications, such as bolting, where stress-corrosion is a possibility, the product should be precipitation heat treated for not less than 4 hours at the highest temperature compatible with the strength requirements but in no
case lower than 1025 °F (552 °C).
Typical applications are reactor construction, highly stressed pump parts and springs
Market grade | SEL | EN | UNS | AISI |
---|---|---|---|---|
17-4 PH | 1.4542 | X5CrNiCuNb16-4 | S17400 | 630 |
ASTM |
---|
A564 |
C | Si | Mn | P | S | Cr | Mo | Ni | Cu | Nb | |
---|---|---|---|---|---|---|---|---|---|---|
max. 0.07 | max. 1.00 | max. 1.00 | max. 0.040 | max. 0.030 | 15.00 to 17.50 | max. 0.60 | 3.00 to 5.00 | 3.00 to 5.00 | 0.15 to 0.45 |