Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
630 is a copper-bearing martensitic precipitation-hardening (PH) stainless steel, the most widely used grade of the PH family. This datasheet presents the material within the American (ASTM / ASME / AMS / UNS) standard system.
With about 17% chromium, 4% nickel and 4% copper plus niobium, 17-4PH combines high strength and hardness with good corrosion resistance and ease of fabrication. It is supplied in the annealed (Condition A, solution-treated) state and is strengthened by a single low-temperature ageing treatment that precipitates a copper-rich phase, with the strength level set by the ageing temperature (the H-condition). The alloy is magnetic. It should not be used above about 315 °C for prolonged periods.
Typical applications include aerospace, oil-and-gas and nuclear components, valve and pump parts, shafts, fasteners, gears, turbine blades and general high-strength corrosion-resistant hardware.
Typical values, H1025 condition.
| Property | Value | Unit |
|---|---|---|
| Density | 7.8 | g/cm³ |
| Melting range | 1400–1440 | °C |
| Elastic modulus | 197 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 10.8 | µm/m·°C |
| Thermal conductivity (20 °C) | 18.3 | W/m·K |
| Specific heat (20 °C) | 460 | J/kg·K |
| Structure | Martensitic (precipitation-hardening) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 15.0 | 17.5 | Corrosion resistance; martensite former |
| Nickel | Ni | 3.0 | 5.0 | Toughness; martensite stability |
| Copper | Cu | 3.0 | 5.0 | Precipitation-hardening phase |
| Niobium | Nb | 0.15 | 0.45 | Carbide stabiliser; grain refinement |
| Manganese | Mn | — | 1.00 | Deoxidiser |
| Silicon | Si | — | 1.00 | Deoxidiser |
| Carbon | C | — | 0.07 | Strength; martensite hardness |
| Phosphorus | P | — | 0.040 | Residual impurity |
| Sulphur | S | — | 0.030 | Residual impurity |
Typical values by ageing (H) condition, per ASTM A564 / AMS 5643 for UNS S17400.
| Condition | Tensile strength | 0.2% Yield | Hardness |
|---|---|---|---|
| H900 | ≥1310 MPa (190 ksi) | ≥1170 MPa (170 ksi) | ~44 HRC |
| H1025 | ≥1070 MPa (155 ksi) | ≥1000 MPa (145 ksi) | ~35 HRC |
| H1075 | ≥1000 MPa (145 ksi) | ≥860 MPa (125 ksi) | ~32 HRC |
| H1150 | ≥930 MPa (135 ksi) | ≥725 MPa (105 ksi) | ~28 HRC |
Confirm against the mill test report. Elongation typically ≥10–16% depending on condition.
| Environment | Performance | Notes |
|---|---|---|
| Atmospheric / general | Good | Superior to 400-series martensitic steels |
| Mild acids (acetic, nitric, dilute) | Good | At low concentrations |
| Chloride pitting | Moderate | Lower than austenitic grades |
| Stress-corrosion cracking | Improved at higher ageing | Over-aged (H1100–H1150) gives best SCC resistance |
| Seawater | Limited | Susceptible to pitting / crevice corrosion |
Corrosion resistance is roughly comparable to type 304 in many environments; resistance and SCC behaviour improve with higher (over-aged) ageing conditions.
A martensitic precipitation-hardening alloy; supplied in Condition A (solution-treated) and hardened by a single low-temperature ageing treatment.
Solution Treatment (Condition A) Approximately 1040 °C followed by cooling to room temperature to form a martensitic structure.
Precipitation Hardening (Ageing) A single low-temperature ageing treatment precipitates a copper-rich phase. The temperature sets the strength level: H900 (~482 °C) gives maximum strength; higher temperatures (H1025, H1075, H1100, H1150) progressively lower strength while increasing toughness and SCC resistance. Air cool after ageing.
Weldable by common fusion and resistance methods; matching filler (AWS A5.4 E630 / ER630) is used. A post-weld heat treatment (solution treat + age) restores corrosion resistance and full properties.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | AWS A5.9 ER630 |
| GMAW / MIG | Good | ER630 |
| SMAW / stick | Good | AWS A5.4 E630 electrode |
Weld in Condition A or over-aged; re-age after welding to restore strength. Oxyacetylene welding is not recommended.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Condition A or H1150M for best machinability |
| Tooling | Carbide tooling; rigid setup |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Limited in hardened conditions; form in Condition A |
| Hot forming | ~1150–950 °C; solution treat + age afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Aerospace | Structural fittings, engine parts, actuators | High strength + corrosion resistance |
| Oil & gas | Valve and pump components, shafts | Strength + corrosion resistance |
| Power generation | Turbine blades, shafts | Strength + moderate corrosion resistance |
| General industrial | Fasteners, gears, high-strength parts | Hardness + machinability |
| Product Form | ASTM Standard | ASME / AMS |
|---|---|---|
| Bar, wire and forgings | ASTM A564 grade 630 | ASME SA-564 / AMS 5643 |
| Plate, sheet and strip | ASTM A693 grade 630 | ASME SA-693 / AMS 5604 |
| Forgings | ASTM A705 grade 630 | ASME SA-705 |
| Castings (equivalent) | ASTM A747 grade CB7Cu-1 | — |
| Welding consumables | AWS A5.4 E630 / A5.9 ER630 | AMS 5825 |
Copper-bearing martensitic precipitation-hardening stainless steel. UNS S17400.
| AISI Type | Cr % | Ni % | Cu % | Other | Best Used For |
|---|---|---|---|---|---|
| 630 | 15–17.5 | 3–5 | 3–5 | Nb | General-purpose PH; high strength |
| 631 | 16–18 | 6.5–7.75 | — | Al | Semi-austenitic PH (17-7PH); springs |
| 632 | 14.75–15.75 | 6.5–7.75 | — | Mo, Al | Semi-austenitic PH (PH15-7Mo) |
| 633 | 15.5–17.5 | 4–5 | — | Mo, N | Semi-austenitic PH (AM-350) |
| 410 | 11.5–13.5 | — | — | — | Martensitic, lower strength |
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