1. What is the difference between 630 and 17-4PH?
None. 630 is the UNS designation, and 17-4PH is the common trade name (17% Cr, 4% Ni, Precipitation Hardening). They refer to the same alloy.
2. Can you supply 630 strip in various age-hardening conditions?
We primarily supply in the Solution Annealed (Condition A) form, which is ideal for fabrication. We can provide guidance on the subsequent heat treatment (aging) you need to perform to achieve required tempers like H900 or H1150.
3. What is the corrosion resistance of 630 compared to 304?
It is generally similar to 304 in many atmospheres and media but is superior in resistance to stress corrosion cracking (SCC).
4. Do you provide Material Certifications?
Yes, every order includes a Mill Test Certificate (MTC) that complies with ASTM A693, verifying chemical composition and mechanical properties.
5. What are the most common applications for 630 strip?
It’s widely used for high-strength parts: springs, bellows, fasteners, medical instruments, pump shafts, and gears.
6. What is your minimum order quantity (MOQ)?
MOQ is typically 1 Ton, but we can accommodate smaller orders for sample evaluation and testing.
7. Can you provide custom slitting to specific widths?
Yes, we offer precision slitting services to produce strips to your exact width requirements.
8. What surface finishes are available?
We commonly supply a cold-rolled finish (e.g., 2B), but other finishes like polished can be arranged.
9. How does the hardness change after heat treatment?
In the annealed condition, hardness is ~≤363 HBW. After aging (e.g., H900), it can reach up to ~44 HRC (approx. 418 HBW).
10. Do you offer free samples?
Yes, we provide free samples for quality verification and testing so you can be confident in the material before placing a full order.
