SUS631 Precipitation-Hardening Stainless Steel Round Bar

What are the equivalent materials for SUS631 stainless steel bars?

SUS631 stainless steel bars, a precipitation-hardening grade, have key equivalent materials including 17-7PH (UNS S17700 / ASTM A693) as its direct counterpart, plus AISI 631, EN 1.4568, and X7CrNiAl17-7 (DIN), all sharing a core alloy composition of 16.0–18.0% Cr, 6.5–7.75% Ni, and 0.75–1.50% Al, ensuring matching precipitation-hardening behavior and mechanical properties (tensile strength ≥1100 MPa in CH900 heat treatment state).

 

17-7PH precipitation hardening steel This type of steel is mainly used to manufacture aircraft shells, structural parts, missile pressure vessels and components, jet engine parts, springs, diaphragms, bellows, antennas, fasteners, measuring instruments, etc

 

17-7PH Stainless Steel Cold Rolled Bar Specifications

Grade	AISI 631, UNS S17700, W.Nr.1.4568, SUS631, 07Cr17Ni7Al
Standard	ASTM A564
Surface	Bright, Pickling, Black, Polished
Shape	Round bar, Flat Bar, Square bar, Hexagonal bar
Diameter	6mm - 600mm

 

SS 17-7PH Round Bar Equivalent Materials

DIN	JIS	GB	ASTM / AISI
1.4568	SUS 631	07Cr17Ni7Al	17-7PH, 631

 

17-7PH Stainless Steel Bar Chemical Composition

Grade	C	Mn	Si	P	S	Cr	Ni	Al
631	0.09	1.0	1.0	0.04	0.03	16.0-18.0	6.5-7.75	0.75-1.5

 

17-7PH Bar Mechanical Properties:

Alloy	Tensile strength Rm N/mm2	Yield strengt RP0.2N/mm2	Elongatio A5%	Brinell hardnes HB
Solid melting 1000~1100℃ fast cooling	≤1030	≤380	≥20	≤229
Aging at 565℃	≥1140	≥960	≥5	≥363
Aging at 510℃	≥1230	≥1030	≥4	≥388

 

Price: 17‑7PH vs 316L vs 17‑4PH vs 15‑5PH Stainless Steel

Material Grade	Typical Market Price	Unit
316L Stainless Steel	~$2,360–$3,270	Per ton
17‑7PH Stainless Steel	~$1,500–$2,500	Per ton
17‑4PH Stainless Steel	~$3,000–$7,200	Per ton
15‑5PH Stainless Steel	Slightly higher than 17‑4PH (~+5–10%)	Per ton

 

17-4 PH vs. 17-7 PH Alloy Bars: 17-4PH and 17-7PH Alloy Bars

Alloy	Classification	Typical Applications
17-4PH	Martensitic precipitation-hardening stainless steel	Shafts, valves, pump components, chemical equipment
17-7PH	Martensitic precipitation-hardening stainless steel with enhanced fatigue resistance	Aerospace springs, high-cycle fatigue components, structural parts

 

Application:

17-7 PH (1.4564, UNS S17700) stainless steel is mainly used to manufacture aircraft shells, structural parts, missile pressure vessels and components, jet engine parts, springs, diaphragms, bellows, antennas, fasteners, measuring instruments, etc.

 

1. Packaging is extremely important, especially in international shipping, as goods need to go through multiple stages before finally reaching their destination. Therefore, we place great emphasis on packaging.
2. GNEE uses various packaging methods depending on the product type. Our product packaging specifications include: Certification: Factory test certificates (e.g., EN10204/3.1), third-party inspection reports available upon request; Surface condition and end treatment (plain end, beveled end); Quantity (tons or pieces) and delivery terms (FOB, CIF, etc.); Packaging requirements (wooden crates, bundling, etc.).