What is the difference between 304 and 630 stainless steel?

GNEE, as a manufacturer in the field of stainless steel for 16 years, today, we will summarize the differences between 304 stainless steel and 630 stainless steel that everyone has been asking about, hoping to help you choose your project. If you still have questions about the use of stainless steel in your project, you can contact us in time to help you!

The main differences between 304 stainless steel pipes and 630 stainless steel pipes are chemical composition, mechanical properties and uses. ‌

‌304 V 630 stainless steel round pipe: chemical composition

630 stainless steel belongs to martensitic precipitation hardening stainless steel. 304 stainless steel belongs to austenitic stainless steel. The corrosion resistance of austenitic stainless steel is better than that of martensitic precipitation hardening stainless steel.

304 V 630 stainless steel seamless pipe: mechanical properties

630 stainless steel can be tempered to achieve a tensile strength of more than 900Mpa. 304 stainless steel cannot be heat treated, and its tensile strength is usually above 700MPA. And the hardness of 630 stainless steel is higher than that of 304 stainless steel. 304 stainless steel can increase its hardness through cold working, and cannot be further strengthened by heat treatment. ‌
630 stainless steel can be strengthened by heat treatment, while 304 and 316 stainless steel cannot be strengthened by heat treatment.

304 V630 stainless steel cold drawn tube uses
304 stainless steel is often used in food processing, medical equipment, architectural decoration and other fields. For example, in water treatment systems, 304 stainless steel reinforcement rings increase the mechanical strength and corrosion resistance of flexible rubber joints, allowing them to maintain stable performance for a long time during water treatment.
630 stainless steel is suitable for applications that require high strength and wear resistance, such as aerospace, petrochemicals, and marine engineering. For example, 630 stainless steel can be used to manufacture high-strength springs and fasteners, as well as parts used in extreme environments.