Project Description

17-4PH · S17400 · Grade 630 — Precipitation Hardening Stainless Steel

17-4PH (UNS S17400, Grade 630) is a PH martensitic stainless steel alloyed with 17% Cr, 4% Ni, and 4% Cu. Age hardening at various temperatures delivers a wide strength–toughness range while maintaining corrosion resistance comparable to Grade 304. Key industries: aerospace, oil & gas, nuclear power, medical devices, and defense.

17-4PH stainless steel round bar
17-4PH Round Bar — S17400 / Grade 630

Equivalent Grades

Standard Designation Specification
ASTM S17400 / 630 A693, A564, A705
AMS — AMS 5604, 5622, 5643, 5678
EN / W.Nr. 1.4542 / X5CrNiCuNb16-4 EN 10088-3
DIN X5CrNiCuNb16-4 DIN 17440
JIS SUS630 JIS G4303, G4304
GOST No direct equivalent GOST 5632 (ref. only)

Applications

Aerospace: turbine blades, pump shafts, structural airframe fittings, helicopter deck fittings, high-strength fasteners, landing gear components, missile body parts.

Oil & Gas: valve stems, pump plungers, choke bodies, downhole mandrels, wellhead components.

Medical: surgical instrument handles, dental instrument shafts, orthopedic implant components.

Nuclear & Chemical: waste container hardware, impellers, agitator shafts, high-pressure vessel closures.

Supply Forms & Dimensions

Form Size Range Reference
Round Bar Ø 6–800 mm ASTM A564
Flat Bar T 3–50 mm × W 10–200 mm ASTM A564
Plate / Sheet T 0.5–100 mm, W ≤ 2000 mm ASTM A693
Seamless Tube OD 6–200 mm, WT 1–20 mm AMS 5604
Wire Ø 0.1–10 mm AMS 5678

Chemical Composition (ASTM A693, wt%)

C Cr Ni Cu Nb+Ta Mn Si P S
≤0.07 15.5–17.5 3.0–5.0 3.0–5.0 0.15–0.45 ≤1.00 ≤1.00 ≤0.040 ≤0.030

Mechanical Properties (ASTM A693 / AMS 5643, bar)

Condition UTS (MPa) YS (MPa) El. (%) RA (%) Hardness
H900 (480 °C / 1 h) ≥1310 ≥1170 ≥10 ≥40 ≥40 HRC
H1025 (550 °C / 4 h) ≥1070 ≥1000 ≥12 ≥44 ≥35 HRC
H1075 (580 °C / 4 h) ≥1000 ≥862 ≥12 ≥45 ≥31 HRC
H1150 (620 °C / 4 h) ≥931 ≥724 ≥16 ≥50 ≥28 HRC