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17-4ph (ASTM A564 / A693 / A705 0Cr17Ni4Cu4Nb（SUS 630)
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17-4ph (ASTM A564 / A693 / A705 0Cr17Ni4Cu4Nb（SUS 630)
PRODUCT DETAILS
✅ Ⅰ. Chemical composition (wt%, typical)
| C | ≤ 0.07 |
| Cr | 15.0 – 17.5 |
| Ni | 3.0 – 5.0 |
| Cu | 3.0 – 5.0 |
| Nb（+Ta） | 0.15 – 0.45 |
| Mn | ≤ 1.0 |
| Si | ≤ 1.0 |
| P | ≤ 0.04 |
| S | ≤ 0.03 |
| Fe | BAL |
✅ II. Typical Properties (Different Heat Treatment Conditions)
Property Items A (Solution Treatment) H900 (Aging) H1025 (Aging)
Tensile Strength Rm (MPa) 930–1030 ≥ 1310 ≥ 1170
Yield Strength Rp0.2 (MPa) ≥ 520 ≥ 1170 ≥ 1070
Elongation A (%) ≥ 20 ≥ 10 ≥ 13
Brinell Hardness HB ≤ 363 ~380–420 ~330–360
✅ Note: Heat treatment condition "H900" is the most commonly used, offering high hardness and strength. Condition A is the solution annealed condition (used for machining followed by aging).
✅ III. Heat Treatment System
State Heat Treatment Method
A (Solution) 1040°C ±10°C / Hold for 1 hour / Air Cool
H900 Solution + 480°C Aging for 8 hours / Air Cool
H1025 Solution + 550°C Aging for 4 hours / Air Cool
H1150 Solution + 620°C Aging for 4 hours / Air Cool
✅ Ⅳ. Common Supply Forms
Round steel, forgings, die forgings, steel plates, bars, rings, flanges, etc.
Heat treatment conditions: A (machined) or H900/H1025 (delivered finished)
Ultrasonic testing, heat treatment reports, and MTC material certifications are available.
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