17-4 Stainless Steel Bar Plate Properties and Supplier

17 -4 stainless steel from Vastmaterial Grade 630 UNS S17400 high strength corrosion resistant bars plates and forgings with heat treatment options.

Product Overview

What is 17-4 PH Stainless Steel (UNS S17400 / Grade 630)?

At Hao Yu Material, we specialize in supplying high-performance alloys that bridge the gap between standard stainless steels and exotic superalloys. 17-4 stainless steel, also designated as AISI 630 or UNS S17400, is the most widely used precipitation-hardening stainless steel in the industrial market.

This chromium-nickel-copper grade is a martensitic stainless steel known for its unique combination of high strength, good corrosion resistance, and toughness. The “17-4” name derives from its chemical composition: approximately 17% chromium and 4% nickel. Unlike standard 300-series grades, 17-4 PH gains its superior mechanical properties through a heat treatment process (precipitation hardening), making it an ideal choice for components requiring high tensile strength and moderate corrosion resistance.

Quick Specs Snapshot: Standards and Key Attributes

We ensure our 17-4 PH inventory meets rigorous international standards to support critical engineering applications.

Available Forms: Round Bar, Flat Bar, Plate, Sheet, Forged Rings

We maintain a comprehensive stock of 17-4 stainless steel ready for immediate processing and global shipment. Our inventory is designed to meet diverse manufacturing needs, from heavy machining to precision fabrication.

• cURL Too many subrequests. Available in various diameters, often supplied in Condition A (Solution Annealed) or pre-hardened conditions (H900, H1150).
• Flat Bars & Blocks: Cut from plate or forged for structural components.
• cURL Too many subrequests. Stocked in multiple thicknesses for aerospace and chemical processing applications.
• cURL Too many subrequests. We provide forged rings and custom shapes tailored to specific project blueprints.

Our facility offers professional cutting services, ensuring you receive materials sized to your exact requirements, minimizing waste and lead time.

Key Features & Benefits

Why Choose 17-4 PH Stainless Steel?

When your project demands a material that doesn’t compromise on either durability or environmental resilience, 17-4 PH (AISI 630) is often the top contender. We stock this precipitation-hardening grade because it uniquely bridges the gap between the corrosion resistance of standard austenitic steels (like 304) and the high strength of martensitic stainless steels (like 410). It is the go-to choice for engineers who need components to withstand heavy loads without succumbing to rust in harsh industrial atmospheres.

High Strength & Hardness Capabilities

The “PH” stands for Precipitation Hardening, which is the secret behind this alloy’s performance. Through simple heat treatments, we can significantly alter the mechanical properties to fit specific stress requirements.

• Tensile Strength: Can reach up to 1100-1300 MPa (160-190 ksi) depending on the heat treatment condition.
• Yield Strength: Exceptionally high, maintaining structural integrity under heavy pressure.
• Твердость: Achieves high Rockwell C hardness levels, making it resistant to wear and abrasion in moving parts.

Corrosion Resistance Compared to 304 and 416

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• Vs. 304 Stainless: cURL Too many subrequests.
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• Механическая обработка: cURL Too many subrequests.
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Technical Specifications

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The versatility of 17-4 PH cURL Too many subrequests.

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Physical Properties

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• cURL Too many subrequests. 0.280 lb/in³ (7.75 g/cm³)
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Heat Treatment & Processing Guide

Achieving the right mechanical properties in 17-4 stainless steel relies entirely on precise heat treatment. While the alloy is valuable for its corrosion resistance, its true strength is unlocked through specific thermal cycling. At Hao Yu Material, we ensure every bar and plate meets strict processing standards before it leaves our facility.

Heat Treatment Conditions for 17-4 PH

The versatility of 17-4 PH lies in its ability to be heat treated to a wide range of strength levels. By adjusting the temperature of the aging process, we can tailor the material’s hardness and ductility to fit specific engineering requirements.

Common conditions include:

• H900: High strength and hardness.
• H1025 & H1075: Balanced toughness and strength.
• H1150 & H1150D: Maximum ductility and impact strength.

Condition A: Solution Annealed State

Most 17-4 stainless steel is supplied in cURL Too many subrequests. (Solution Annealed). In this state, the material has been heated to approximately 1900°F (1040°C) and air-cooled.

• Characteristics: Condition A offers the lowest hardness and tensile strength for this grade but provides the best machinability prior to hardening.
• cURL Too many subrequests. It is rarely used in service in this condition due to susceptibility to stress corrosion cracking. It serves as the starting point for subsequent aging treatments.

Aging and Precipitation Hardening Processes

To reach peak performance, the material undergoes precipitation hardening (aging). This involves heating the Condition A material to a specific temperature (between 900°F and 1150°F) for a set duration, usually 4 hours, followed by air cooling.

• Low-Temperature Aging (e.g., H900): Results in higher tensile strength and hardness but lower ductility.
• High-Temperature Aging (e.g., H1150): Increases ductility and toughness while slightly reducing overall strength.

This flexibility allows engineers to use the same alloy for diverse applications, from high-stress aerospace components to heavy-duty marine shafts.

Vastmaterial Heat Treatment Services

We understand that sourcing raw material is only half the battle. Hao Yu Material provides comprehensive heat treatment services to deliver 17-4 PH in the exact condition your project requires. Whether you need the machinability of Condition A or the extreme durability of Condition H900, we handle the thermal processing so your material arrives ready for immediate use.

Our capabilities include:

• Custom Aging: Processing to specific H-conditions (H900 through H1150).
• Quality Verification: Hardness testing to confirm mechanical properties post-treatment.
• Consistent Results: Strict temperature control to ensure uniform properties across the entire batch.

Промышленные применения

When you need a material that balances high strength with solid corrosion resistance, 17-4 stainless steel (Grade 630) is often the go-to choice across major industries. We see this alloy deployed in environments where standard stainless grades just can’t handle the mechanical stress, or where high-strength carbon steels would fail due to corrosion.

Typical Applications of Grade 630

cURL Too many subrequests. 17-4 PH can be heat-treated to various hardness levels, it is incredibly versatile. We supply this material to manufacturers who need reliability in critical components.

• Aerospace Structural Parts and Turbine Blades: The high strength-to-weight ratio makes UNS S17400 ideal for aircraft structures, engine mounts, and turbine blades that operate under high stress.
• Oil & Gas Valve Stems and Pump Shafts: cURL Too many subrequests. 17-4 stainless steel cURL Too many subrequests.
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• Flat Bars & Blocks: cURL Too many subrequests.
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• Black Surface: Hot rolled or forged condition, suitable for initial rough machining.
• Peeled/Rough Turned: Removes the surface oxide layer and defects, ready for immediate machining.
• Centerless Ground: High-precision finish for tight tolerance applications like pump shafts.
• HRAP (Hot Rolled Annealed and Pickled): Clean, matte finish standard for plates and sheets.

Quality Assurance & Logistics

cURL Too many subrequests. 17-4 stainless steel from us, you aren’t just buying metal; you are buying certainty. We understand that for industries like aerospace and oil & gas, a material failure isn’t an option. That is why our quality control protocols are rigorous and transparent.

Quality Control & Shipping Protocols

Every batch of 17-4 PH that leaves our facility undergoes a strict inspection process. We don’t just rely on mill certificates; we verify the data. Our logistics team is experienced in international trade, ensuring that documentation, customs clearance, and shipping schedules align perfectly with your project timelines. We handle the heavy lifting of logistics so you can focus on production.

Testing Methods

To ensure the material meets AMS 5643 or cURL Too many subrequests. standards, we employ advanced testing methods:

• cURL Too many subrequests. We scan for internal flaws or voids that could compromise structural integrity.
• Charpy Impact Testing: This verifies the toughness of the steel, ensuring it can withstand sudden stress without fracturing.
• Hardness Testing: Whether you need Condition A or H900, we verify the Rockwell hardness (HRC) to confirm the heat treatment was successful.

Certifications: ISO 9001 and MTRs

Trust is built on documentation. We operate under ISO 9001 quality management systems. Every shipment includes a full Material Test Report (MTR). This document traces the heat number, chemical composition, and mechanical properties, giving you full traceability from the melt to your loading dock.

Export-Standard Packaging

Shipping heavy steel across the ocean requires robust protection. We use export-standard packaging designed to prevent moisture damage and physical impact during transit.

• Wooden Crates: Fumigated and sturdy for heavy bars and plates.
• Waterproof Wrapping: Prevents rust and corrosion from sea air.
• Secure Strapping: Keeps bundles tight and safe for forklift handling.

Часто задаваемые вопросы (FAQ)

FAQ about 17-4 Stainless Steel

Is 17-4 stainless steel magnetic?
Yes, 17-4 stainless steel is magnetic. Unlike the 300-series austenitic stainless steels (like 304 or 316) which are generally non-magnetic, 17-4 PH is a martensitic precipitation-hardening grade. It retains its magnetic properties in both the solution-annealed (Condition A) and heat-treated (aged) conditions.

What is the difference between 17-4 and 316?
The primary tradeoff is between strength and corrosion resistance.

• cURL Too many subrequests. Delivers superior tensile strength and hardness, making it the go-to for high-stress structural components. Its corrosion resistance is comparable to 304 but slightly less than 316 in chloride environments.
• Grade 316: Offers better corrosion resistance, especially in marine settings, but cannot be hardened by heat treatment to the same levels as 17-4.

Can you weld 17-4 PH?
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