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17-4PH (UNS S17400) Stainless Steel Round Bar Supplier in Mumbai, India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier and stockist based in Mumbai, India. We supply 17-4PH (UNS S17400) Stainless steel round bar according to ASTM A564 / ASME SA564, Type 630, and AMS 5643.
17-4PH round bar is a precipitation-hardening martensitic stainless steel. UNS S17400 (W.Nr. 1.4542 / AISI 630 / SUS 630) contains approximately 17% chromium, 4% nickel, and 4% copper with niobium additions that trigger precipitation strengthening during age-hardening heat treatment. In the H900 condition, this bar delivers tensile strength up to 190 ksi (1310 MPa), yield strength of 170 ksi (1170 MPa), and hardness of 40–47 HRC. We supply UNS S17400 round bar with EN 10204 3.1 mill test certificates. 17-4 PH stainless steel bar maintains high strength and durability at temperatures up to 315°C (600°F) for structural service. It provides oxidation resistance to 600°C for intermittent exposure. The alloy is magnetic in all conditions and responds to a single-step ageing cycle, producing a wide strength-to-toughness spectrum from Condition A through H1150D.
Diameters of 17-4PH SS round bar range from 4 mm to 400 mm in lengths of 1 to 6 metres, supplied in Condition A or aged to H900 through H1150D. They are available in forms like round bar, hex bar, square bar, flat bar, forged bar, bright bar, and rod. These bars serve key industries like oil & gas, aerospace & defence, chemical & petrochemical processing, power generation, marine & offshore, food & pharmaceutical processing, and nuclear.
17-4PH Round Bar & Rod Specifications
| Specification | ASTM A564 / ASME SA564 |
|---|---|
| Type / Grade | Type 630 |
| AMS | 5643 (Bar, Wire, Forgings, Tubing, Rings) |
| Round Bar Diameter | 4 mm – 400 mm |
| Hex Bar | 18 – 57 mm AF |
| Square Bar | 18 – 47 mm |
| Bright Bar | 4 – 100 mm diameter |
| Length | 1 – 6 metres, custom cut |
| Process | Hot Rolled, Cold Drawn, Forged, Peeled, Centreless Ground |
| Condition | Condition A, H900 through H1150D |
| Finish | Black, Bright, Rough Turned, No.4, BA, Peeled |
17-4PH vs 15-5PH vs SS 304
| Property | 17-4PH | 15-5PH | SS 304 |
|---|---|---|---|
| Type | Martensitic PH | Martensitic PH | Austenitic |
| Tensile (H900/Ann.) | 190 ksi | 190 ksi | 75 ksi |
| Yield (H900/Ann.) | 170 ksi | 170 ksi | 30 ksi |
| Transverse Toughness | Good | Superior | Excellent |
| Corrosion | ≈ 304 | Slightly < 304 | Baseline |
| Magnetic | Yes | Yes | No |
| ASTM Bar Spec | A564 T630 | A564 XM-12 | A276 |
Chemical Composition of 17-4PH Round Bar
| Element | Chromium (Cr) | Nickel (Ni) | Copper (Cu) | Niobium + Tantalum (Cb+Ta) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulphur (S) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|---|---|
| Composition | 15.00 – 17.50 | 3.00 – 5.00 | 3.00 – 5.00 | 0.15 – 0.45 | 0.07 max | 1.00 max | 1.00 max | 0.040 max | 0.030 max | Balance |
Mechanical Properties of 17-4PH Stainless Steel Bar
| Condition | Yield Strength (ksi) | Tensile Strength (ksi) | Elongation (%) | Reduction of Area (%) | Hardness (HRC) |
|---|---|---|---|---|---|
| Cond. A | – | – | – | – | 38 max |
| H900 | 190 | 170 | 10 | 40 | 40–47 |
| H925 | 170 | 155 | 10 | 44 | 38–45 |
| H1025 | 155 | 145 | 12 | 45 | 34–42 |
| H1075 | 145 | 125 | 13 | 45 | 31–38 |
| H1100 | 140 | 115 | 14 | 45 | 30–37 |
| H1150 | 135 | 105 | 16 | 50 | 28–37 |
| H1150M | 125 | 105 | 16 | 50 | 24–33 |
| H1150D | 125 | 105 | 16 | 50 | 24–33 |
Physical Properties of 17-4PH Bar
| Property | Density | Melting Range | Elastic Modulus | Thermal Expansion (21–100°C) | Thermal Conductivity (100°C) | Electrical Resistivity (21°C) | Specific Heat (21°C) | Magnetic Response |
|---|---|---|---|---|---|---|---|---|
| Value | 7.80 | 1404 – 1440 | 197 | 10.8 × 10⁻⁶ | 18.3 | 0.80 | 460 | Yes – ferromagnetic |
| Unit | g/cm³ | °C | GPa | /°C | W/m·K | µΩ·m | J/kg·K | – |
17-4PH Round Bar Equivalent Designations
| Property | UNS | Standard | DIN / EN | JIS | AFNOR | ISO |
|---|---|---|---|---|---|---|
| Specification | S17400 | A564 / SA564 Type 630 | 1.4542 / X5CrNiCuNb16-4 | SUS 630 | Z7CNU17-04 | 15156 |
Get 17-4PH Stainless Steel Bar at Competitive Prices
Available Forms of 17-4PH Stainless Steel Bar
17-4PH Round Bar
17-4PH Hollow Bar
17-4PH Hex Bar
17-4PH Flat Bar
17-4PH Rectangular Bar
17-4PH Forged Bar
17-4PH Square Bar
17-4PH Rods
Heat Treatment Conditions for 17-4PH Bar
| Cond. | Aging Temp | Time | Cool | Primary Use |
|---|---|---|---|---|
| A | 1038°C (1900°F) soln. | – | Air | Machining / forming blank |
| H900 | 482°C (900°F) | 1 hr | Air | Max strength: gears, actuators |
| H925 | 496°C (925°F) | 4 hr | Air | High strength, slight toughness gain |
| H1025 | 552°C (1025°F) | 4 hr | Air | Balanced: pump shafts, fasteners |
| H1075 | 580°C (1075°F) | 4 hr | Air | Moderate-load structural parts |
| H1100 | 593°C (1100°F) | 4 hr | Air | Improved toughness |
| H1150 | 621°C (1150°F) | 4 hr | Air | Best SCC resistance: marine, subsea |
| H1150M | 760°C 2h + 621°C 4h | – | Air | Max toughness and impact |
| H1150D | 621°C 4h + 621°C 4h | – | Air | Double-aged toughness |
Industries Using 17-4PH Round Bar
- Subsea valve stems, pump shafts (H1025/H1150), wellhead components per NACE MR0175.
- Landing gear, fasteners, and actuator rods as per AMS 5643.
- Agitator shafts where 410 lacks corrosion resistance, and 316L lacks strength.
- Steam valve stems to 315°C.
- Propeller shafts in H1150 for chloride SCC resistance.
- Mixer shafts with 304-level corrosion resistance and higher wear resistance.
How to Order 17-4PH Round Bar & Rod from Nicorex Alloys
- Specification & Grade: ASTM A564 Type 630 / AMS 5643 (state which drawing calls out)
- Size: Diameter in mm or inches, length requirement
- Heat Treatment Condition: Condition A, H900, H925, H1025, H1075, H1100, H1150, H1150M, or H1150D
- Surface Finish: Black, bright, peeled, rough turned, centreless ground
- Quantity: Weight in kg or number of pieces
- Test Requirements: EN 10204 3.1 MTC, 3.2 third-party inspection, PMI, ultrasonic testing (ASTM A388)
- Packing: Standard bundle, wooden crate, individual protection for precision bars
Frequently Asked Questions
Is 17-4PH Bar Suitable for Seawater Service?
17-4PH provides moderate resistance in flowing seawater but is susceptible to crevice corrosion in stagnant conditions. Specify H1150 or H1150M for maximum SCC resistance. For static submersion, consider duplex 2205.
What is the Maximum Service Temperature for 17-4PH Round Bar?
17-4PH maintains its precipitation-hardened properties up to 315°C (600°F) for continuous structural service. Above this, over-ageing reduces hardness. Oxidation resistance extends to ~600°C, but structural use is limited. For higher temperatures, consider Inconel 718.
Does 17-4PH Require Post-Weld Heat Treatment?
PWHT is strongly recommended. Weld in Condition A, then age to the required condition. Use AWS E/ER630 filler for matching properties. For non-structural welds, ER308L can be used without ageing.
What is the Difference Between ASTM A564 and AMS 5643?
ASTM A564 covers general industrial applications. AMS 5643 adds tighter controls, traceability, and NDE testing for aerospace. Specify AMS 5643 for aerospace; ASTM A564 for oil and gas and industrial use.
What is the Price of 17-4PH Round Bar per kg in India?
The price of 17-4PH varies from ₹350 to ₹900 per kg, depending on the size, condition, finish, quantity, and certification. Condition A bars usually cost less than H900-aged bars as they have gone through extra heat treatment. Aerospace-grade AMS 5643 bars cost more than ASTM A564 commercial-grade bars. For the latest prices based on your exact specifications and quantity, get in touch with Nicorex Alloys.