17-4 Stainless Steel Round Bar Supplier

Good resistance to a wide range of corrosive environments; approaching that of Grade 304 stainless steel. Subject to pitting and crevice corrosion in warm chloride environments. Highly resistant to stress corrosion cracking if aged at 550°C or higher. Higher aging temperatures give better SCC resistance.

The grade has substantially lower corrosion resistance in solution treated Condition A, and should not be used in that condition, even if the hardness is considered satisfactory.

This grade has good oxidation resistance, but to avoid reduction of its mechanical properties and hardness it should not be used above its age hardening temperature. Prolonger exposure in the range 370-480°C should be avoided if ambient temperature toughness is critical.

Solution treatment (Condition A) - Heat at 1040°C for ½ hour and cool to 30°C maximum in air. Oil quenching may be used for small non-intricate sections.

Hardening - After solution treatment a single low temperature "age hardening" treatment is employed to achieve required properties, as below. This treatment results in no distortion and only superficial discolouration. A slight decrease in size (shrinkage) takes place during the hardening process, this is approximately 0.05% for Condition H900 and 0.10% for H1150.

Typical mechanical properties achieved after solution treating and then age hardening at the indicated temperatures are as in Table 6. The Condition is designated by the age hardening temperature in °F.

Can be successfully welded by all standard methods. Preheating is not necessary. Properties comparable to those of the parent metal may be achieved in the weld metal by post-weld heat treatment. As for other high strength steels precaution should be taken in design and welding procedures to avoid concentration of weldment stresses.

This steel is usually supplied in the solution treated condition, in which it can be machined. Machining rates approximate those of Grade 304.