17-7PH precipitation hardening stainless steel, corresponding to SUS 631/S17700/0Cr17Ni7Al/ASTM A693. 17-7PH is an austenitic martensitic precipitation hardening stainless steel developed based on 18-8CrNi, also known as controlled phase change stainless steel.
After solid solution treatment, 17-7PH stainless steel has an unstable austenite structure with good plasticity, toughness, and workability. After adjustment, the carbide phenological composition of austenite precipitation changes. After martensitic transformation treatment, most of the structure transforms into low-carbon tempered martensite with good toughness. This state is the service state of the steel and has good intermediate-temperature mechanical properties.
17-7PH has better corrosion resistance than general martensitic stainless steel.
17-7PH precipitation hardening stainless steel, with high strength, high hardness, fatigue resistance, good corrosion resistance, malleability, and little deformation when exposed to high temperatures. This steel has good properties and is particularly suitable for the aerospace industry. This special alloy is also suitable for other fields with high strength and corrosion resistance requirements.
At high temperatures up to 316 ℃, the spring performance remains good.
SUS 631 is used in aerospace, chemical, petrochemical, papermaking, and metal processing industries.
Specifications of 17-7PH Stainless steel bar
| Product Name | 17-7PH S17700 Stainless steel bar/rod / Stainless steel round bar |
| Specifications | ASTM A693, AMS 5528, AISI 631, W.NR 1.4541, UNS S17700, SUS 631 |
| Standards | ASTM, SAE, EN, DIN, JIS, ISO, KS, NF, ISC, GB |
| Length | Customized according to customer requirements |
| Diameter | Within 700mm |
| Application | Kitchenware, home appliances, construction decoration, stairs, refrigerated containers, burner parts, exhaust parts of auto |
17-7 PH Stainless Steel Bar Standard Specifications
ASTM A313 (631), A564 (631), A579 (631), A579 (grade 62), A693 (631)，A705 (631)
AMS 5528, 5529, 5568, 5644, 5673, 5678, 5824
ASME SA-705, SA-693
UNS S17700
AISI 631
W.NR 1.4541
DIN 1.4568
MIL SPEC MIL-W-46078
SAE J217, J467
GE S-400 / S-SPEC-35
RR SABRe Edition 2
Equivalent grades
| SAE | ASTM | JIS | NF | DIN | UNS | GB | AISI | GOST | EN |
|---|---|---|---|---|---|---|---|---|---|
| 17-7PH | A693 | SUS 631 | Z8CNA17-7 | X7CrNiAI17-7(1.4568) | S17700 | 0Cr17Ni7Al | 631 | 09X17H7ю | X7CrNiAl17-7 |
Chemical composition
| Grade | C | P | Si | Ni | Cu | Fe | Mn | S | Cr | AL |
| 17-7 PH | .09 | .04 | 1.0 max | 6.50 – 7.75 | – | Bal | 1.0 max | 0.04 | 16.0 – 18.0 | .75 – 1.50 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength, psi | 170,000 min |
| Yield Strength at 0.2% Offset | 140,000 min |
| Elongation % in 2 in. or 4D | 6 min |
| Reduction of Area | 25 min |
Application
The substance finds application in the following areas: diaphragms; low and high-temperature parts; tanks; valve parts; springs, food knives; heat exchangers; special fittings and installations; machine constructions, and components. Strips, wires, sheets, and bars made of steel are used in the aerospace, petroleum, chemical, petrochemical, energy, food, and cryogenic industries.
Heat Treatment Condition A – 1065°C saturated
Circumstances TH1050: Age for 1.5 hours at 1050 F (566 C), cool for 1 hour to 55 F (15 C), and then saturate for 1.5 hours at 1400 F (760 C).
Circumstances RH950: Saturate at 1750 F (954 C) for 10 minutes while using air cooling. After that, let the product drop to -100 F (-73 C) for about 1.5 hours, then let it age for an hour at 950 F (510 C).
Condition C: Post-cold rolling conditions
Condition CH900: Cold-rolled state following an air-cooled maturing period of one hour at 900 F (482 C).
Welding
Stainless steel grade 17-7 PH can be processed using standard arc and resistance techniques. In order to lessen the oxidation of aluminum during the fusion welding process, inert gas shielding is suggested.
Machinability
75% of B1112 is the machinability rating for stainless steel grade 17-7 PH. This alloy needs chip breakers because it exhibits lengthy, sticky chips during milling. It is advised that for best results, machining be done at modest rates with continuous feeds.
