17-4-PH Flat Bars
The 17-4 PH stainless steel is a precipitation-hardening grade, capable of achieving high-level mechanical strength after appropriate heat treatment (Condition A, H900, H1025, H1100, H1150). At Rose Metal Industries, we supply flat bars in these tempers so clients can choose based on their requirements — whether high tensile strength, hardness or a balance of ductility and toughness. This flexibility makes 17-4 PH flat bars ideal for applications such as shafts, pump components, machine parts, structural supports and marine fittings even in corrosive or cyclic load environments common in coastal areas like Chennai, Visakhapatnam, Mangaluru, Puducherry and Port Blair.
Quality is ensured through rigorous testing — each batch of flat bars undergoes chemical analysis (PMI), hardness testing, tensile & yield strength verification, dimensional inspection and full documentation including Mill Test Certificate (MTC). Rose Metal Industries maintains ready stock and ensures prompt delivery to industrial hubs such as Bengaluru, Hyderabad, Coimbatore, Vijayawada, Tirupati, Trichy and island territories — providing both standard sizes and custom cut-to-length or machined bars per customer specification.
Due to high strength, good corrosion resistance, and robustness even under stress or elevated temperature, 17-4 PH flat bars are widely used in manufacturing of high-strength components: gears, shafts, tooling parts, valve bodies, pump components, structural brackets, offshore marine hardware, and heavy machinery frames. Their resistance to fatigue, stress-corrosion, and ability to retain hardness after heat treatment make them particularly suitable for engineering projects in chemical plants, oil & gas, marine, aerospace and industrial machinery — especially for projects located in coastal or high-humidity zones like Tamil Nadu coast, Andhra Pradesh ports, Karnataka coast, Puducherry, and Andaman & Nicobar installations.
Due to high strength, good corrosion resistance, and robustness even under stress or elevated temperature, 17-4 PH flat bars are widely used in manufacturing of high-strength components: gears, shafts, tooling parts, valve bodies, pump components, structural brackets, offshore marine hardware, and heavy machinery frames. Their resistance to fatigue, stress-corrosion, and ability to retain hardness after heat treatment make them particularly suitable for engineering projects in chemical plants, oil & gas, marine, aerospace and industrial machinery — especially for projects located in coastal or high-humidity zones like Tamil Nadu coast, Andhra Pradesh ports, Karnataka coast, Puducherry, and Andaman & Nicobar installations..
Specifications
| Standard / Spec | ASTM A564 / AMS 5643 / UNS S17400 (or customer-specified standards) |
|---|---|
| Material | 17-4 PH Stainless Steel (AISI 630 / UNS S17400) |
| Forms | Flat Bars (standard & custom sizes, cut-to-length, machined or polished finish) |
| Heat Treatment Conditions | Condition A (solution annealed), H900, H1025, H1100, H1150 (precipitation hardened) |
| Finish | Mill finish, pickled & passivated, polished, custom finishes on request |
| Quality Documentation | MTC, PMI report (on request), Hardness & Tensile Test Reports |
Chemical Composition (Typical)
| Element | Wt % (typical range) |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Chromium (Cr) | 15.0 – 17.5 |
| Nickel (Ni) | 3.0 – 5.0 |
| Copper (Cu) | 3.0 – 5.0 |
| Niobium + Tantalum (Nb+Ta) | 0.15 – 0.45 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
| Iron (Fe) | Balance |
Note: Certified chemical analysis is provided with each batch in the MTC; values may vary slightly per order/supplier lot.
Mechanical Properties (Typical by Heat Treatment Condition)
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|
| H900 | ≈ 1100 – 1400 | ≈ 1000 – 1250 | ≈ 3 – 8 | ~ 40 – 45 HRC |
| H1025 / H1150 | ≈ 900 – 1100 | ≈ 700 – 1000 | ≈ 8 – 18 | ~ 30 – 39 HRC |
| Solution Annealed (Condition A) | ≈ 600 – 850 | ≈ 300 – 700 | ≈ 20 – 30 | ~ 200 – 300 HB (varies) |
Select heat treatment temper based on required balance of strength vs ductility; Rose Metal Industries can recommend the optimum condition per application.
Equivalent Grades
- AISI / ASTM: 17-4 PH (630)
- UNS: S17400
- Werkstoff / EN: 1.4542 / X5CrNiCuNb16-4 (closest equivalent)
Typical Dimension Chart — Flat Bars (Common Sizes)
| Thickness (mm) | Width (mm) | Length (mm) | Remarks |
|---|---|---|---|
| 5 | 25 – 100 | 1000 – 6000 | Standard stock |
| 8 | 30 – 150 | 1000 – 6000 | Cut-to-size available |
| 10 | 50 – 200 | 1000 – 6000 | Heavy-duty sections |
| 12 | 75 – 250 | 1000 – 6000 | Custom orders accepted |
| 15 | 100 – 300 | 1000 – 6000 | Custom fabrication possible |
Custom widths, thicknesses and lengths can be supplied on request depending on project requirements and order volume.
Applications
- Shafts, pump components, valve parts and mechanical hardware
- Marine and offshore components in ports and coastal installations (Tamil Nadu, Andhra Pradesh, Karnataka, Puducherry, Andaman & Nicobar)
- Structural supports, brackets, frames and heavy-engineering parts
- Aerospace fixtures, tooling and precision engineered components
- Chemical and petrochemical plant equipment where corrosion resistance and strength are critical
- Industrial machinery, mining equipment, pressure vessels and high-stress components
With a commitment to quality, reliability, and customer satisfaction, we continue to expand our stainless steel distribution network across South India, including Chennai, Bengaluru, Hyderabad, Tirupati, Mangalore, Belgaum, Nellore, Kakinada, and the Andaman & Nicobar Islands. Whether it's structural support, pressure equipment, architectural projects, or precision engineering components, our Stainless Steel 304/304L Round Bars offer unmatched performance.
Backed by decades of experience and a strong technical workforce, Rose Metal Industries ensures that every Stainless Steel 304 and 304L Round Bar meets the expectations of industries in Tamil Nadu, Andhra Pradesh, Karnataka, Telangana, Puducherry, and the Andaman & Nicobar Islands. Our goal is to provide high-quality stainless steel solutions with superior consistency, competitive pricing, and fast delivery for national and international clients.
Frequently Asked Questions (FAQ)
Q1: What is 17-4 PH stainless steel flat bar?
A: It is a precipitation-hardening martensitic stainless steel (UNS S17400 / AISI 630) flat bar that combines high strength, hardness and corrosion resistance — ideal for heavy-duty and high-stress applications.
Q2: Do you provide Mill Test Certificate (MTC) and test reports?
A: Yes — every supply batch from Rose Metal Industries is accompanied by full MTC, with optional PMI, hardness and tensile test reports on request.
Q3: In which conditions are flat bars available?
A: We supply 17-4 PH flat bars in Condition A (solution annealed), H900, H1025, H1100, and H1150 — depending on the customer’s strength and hardness requirements.
Q4: Can you supply custom sizes or thicknesses?
A: Yes — Rose Metal Industries offers cut-to-length, custom width/thickness, machining, polishing or coating as per project specifications.
Q5: Are these flat bars suitable for marine/coastal applications?
A: Yes — 17-4 PH offers good corrosion resistance and high strength, making it suitable for marine, offshore, coastal installations in Tamil Nadu, Andhra Pradesh, Karnataka, Puducherry and Andaman & Nicobar Islands. For highly aggressive chloride environments, appropriate coatings or maintenance may be recommended.