630 Stainless Steel Fittings: High-Strength, Corrosion-Resistant Fittings for Demanding Applications
Meta Description: Discover 630 stainless steel fittings with excellent corrosion resistance and strength (up to 1300 MPa). Ideal for oil & gas, aerospace, and high-pressure industries. Find buttweld, threaded, and socket weld fittings.
Introduction
630 stainless steel fittings, also known as precipitation-hardening 630 stainless steel, are designed for high-performance applications that demand both superior strength and corrosion resistance. With a yield strength of up to 1300 MPa, these fittings are ideal for industries where high pressure and harsh environments are common, such as oil & gas, aerospace, and medical.
A member of the martensitic stainless steel family, 630 stainless steel offers exceptional strength-to-corrosion resistance ratio, making it perfect for high-pressure systems, nuclear reactor components, aerospace structural fittings, and other demanding applications. These fittings are available in various forms, including buttweld, threaded, and socket weld fittings, providing a versatile solution for pipe connections in diverse industries.
The key advantages of 630 stainless steel fittings are their fatigue resistance, machinability in annealed condition, and the ability to withstand extreme environments such as sour service or chloride conditions. As a precipitation-hardening alloy, these fittings can achieve high hardness and strength through heat treatment, offering the flexibility to meet specific application requirements.
At [Your Company Name], we offer the best 630 stainless steel fittings at competitive prices, ensuring high-quality products, fast global delivery, and full certification packages.
Product Overview & Superior Advantages
- Exceptional Strength: With a yield strength of up to 1300 MPa, 630 stainless steel fittings provide superior mechanical performance in high-pressure applications.
- Excellent Corrosion Resistance: These fittings offer superior corrosion resistance compared to conventional stainless steels like 304 and 316, making them ideal for oil & gas, aerospace, and chemical processing.
- Versatility: Available in a wide range of fittings, including buttweld, threaded, and socket weld options, ensuring adaptability to various piping systems.
- Fatigue Resistance: 630 stainless steel fittings excel in high-fatigue environments, making them suitable for demanding applications like aerospace structural fittings and high-pressure hydraulic lines.
- Machinability: In the annealed condition, 630 stainless steel is highly machinable, allowing for easy customization and rapid production.
Detailed Advantages:
- High Strength & Durability: Capable of withstanding extreme forces, these fittings are ideal for applications requiring high tensile strength and resistance to stress.
- Corrosion Resistance in Harsh Environments: 630 stainless steel fittings excel in chloride and sour service environments, making them suitable for chemical processing and petrochemical applications.
- Customization & Certification: Available with full EN 10204 3.1/3.2 certificates, NACE MR0175, and PED compliance, ensuring full traceability and industry compliance.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 15–17.5 |
| Nickel (Ni) | 3–5 |
| Copper (Cu) | 3–5 |
| Niobium + Tantalum (Nb + Ta) | 0.15–0.45 |
| Carbon (C) | ≤ 0.07 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
The chemical composition of 630 stainless steel fittings includes chromium, nickel, and copper, providing a balance of strength and corrosion resistance. The alloy also contains niobium and tantalum, which facilitate precipitation hardening, enhancing the material’s mechanical properties.
Mechanical Properties
| Condition | Yield Strength (MPa) | Ultimate Tensile Strength (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|
| Solution Annealed | 550 | 850 | 20 | 25–30 |
| H900 | 900 | 1150 | 10 | 38–42 |
| H925 | 925 | 1200 | 8 | 40–44 |
| H1025 | 1025 | 1250 | 6 | 42–46 |
| H1150 | 1150 | 1300 | 5 | 43–47 |
| H1150M | 1150 | 1300 | 4 | 45–49 |
630 stainless steel fittings exhibit outstanding mechanical properties, including a yield strength of up to 1300 MPa in the H1150M condition. This makes them suitable for applications requiring high strength, such as oil & gas and aerospace components.
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.80 |
| Thermal Conductivity (W/m·K) | 16.0 |
| Magnetic (after hardening) | Yes |
The density of 630 stainless steel fittings is 7.80 g/cm³, with a thermal conductivity of 16 W/m·K. After hardening, these fittings become magnetic, which is useful in specific applications where magnetic properties are required.
630 vs 17-4PH vs 304 vs 316 vs 410 Fittings Comparison
| Property | 630 Stainless Steel Fittings | 17-4PH Stainless Steel Fittings | 304 Stainless Steel Fittings | 316 Stainless Steel Fittings | 410 Stainless Steel Fittings |
|---|---|---|---|---|---|
| Yield Strength (MPa) | 1300 | 1100 | 250 | 290 | 500 |
| Corrosion Resistance | Excellent | Excellent | Good | Excellent | Fair |
| Hardness (HRC) | 38–49 | 38–44 | 20–30 | 25–35 | 40–45 |
| Heat Treatment | H900, H925, H1025, H1150 | H950, H900 | Annealed | Annealed | H900 |
| Cost | Moderate | Moderate | Low | High | Moderate |
In comparison with other materials like 304, 316, and 410, 630 stainless steel fittings offer superior strength and corrosion resistance, making them a cost-effective alternative for many high-performance applications.
Available Types & Specifications
| Type | Size Range (NPS) | Wall Thickness | Pressure Rating | Standards | Surface Finish |
|---|---|---|---|---|---|
| Buttweld (Seamless & Welded) | 1/2″–48″ | Sch 10S–XXS | 2000#–9000# | ASTM A403 WP630, A182 F630 | Annealed & Pickled, Bright Annealed, Polished |
| Threaded & Socket Weld (Forged) | 1/8″–4″ | - | 2000#–9000# | ASME B16.9, B16.11 | Annealed & Pickled, Bright Annealed, Polished |
630 stainless steel fittings are available in buttweld, threaded, and socket weld configurations, suitable for sizes ranging from 1/2″ to 48″ (buttweld) and 1/8″ to 4″ (forged). These fittings come in a variety of pressure ratings and meet multiple industry standards, including ASTM A403 WP630, A182 F630, ASME B16.9, and B16.11.
Heat Treatment & Precipitation Hardening Guide
The solution annealing of 630 stainless steel fittings occurs at 1038 °C, followed by aging at H900, H925, H1025, H1150, and H1150M conditions. These processes result in a range of hardness (28–44 HRC) and strength (up to 1300 MPa) values tailored for specific applications.
Major Applications
- Oil & Gas: Wellhead fittings, pump & valve trim, downhole tool fittings
- Aerospace: Structural fittings, hydraulic fittings, high-pressure piping
- Medical: Instrument connections, surgical fittings, medical device applications
- Chemical Processing: Valve trim, reactor fittings, pressure vessels
- Nuclear: Reactor components, turbine casings
- High-Pressure Systems: Hydraulic systems, pressure lines
- Petrochemical: Processing lines, fasteners, flanges
630 stainless steel fittings are widely used in oil & gas, aerospace, medical, and high-pressure applications where both high strength and corrosion resistance are essential.
Product Images
Polished 630 stainless steel buttweld elbows and tees in H900 condition ready for export
Professional infographic 630 stainless steel fittings data sheet + strength vs aging temperature curve
Real-installation collage – 630 fittings used in oil & gas Christmas trees, pump shafts, aerospace brackets, and high-pressure valve systems
Why We Are the Best 630 Stainless Steel Fittings Distributor
- Largest Stock: We maintain the largest stock of 630 stainless steel fittings in all heat-treated conditions.
- Direct Mill Relationships: We source directly from mills for the best pricing and availability.
- In-house Heat Treatment & Polishing: We offer custom heat treatment and polishing services to meet your specifications.
- 100% PMI + Ultrasonic + Hardness Testing: All products undergo quality control including Positive Material Identification and non-destructive testing.
- Full Certification: We provide full EN 10204 3.1/3.2, PED, NACE MR0175 compliance and other certifications.
- Global Delivery: Fastest delivery times and unbeatable pricing for 630 stainless steel fittings.
Packaging & Quality Standards
Our 630 stainless steel fittings are packaged securely in individual plastic wrapping, wooden cases, and include a full certification package. All fittings are protected with end caps to ensure no damage during shipping.
FAQ Section
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What is the maximum hardness of 630 stainless steel fittings?
- The maximum hardness of 630 stainless steel fittings can reach up to 49 HRC in the H1150M condition.
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Is 630 stainless steel fittings magnetic after hardening?
- Yes, 630 stainless steel fittings become magnetic after heat treatment.
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630 vs 17-4PH differences & when to choose 630?
- Both are precipitation-hardening alloys, but 630 stainless steel has a higher yield strength and is better for high-fatigue applications, whereas 17-4PH is better for corrosion resistance.
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Can 630 fittings be welded and what filler?
- Yes, 630 fittings can be welded with a 308L or 630 welding filler rod.
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Recommended condition for maximum strength (H900)?
- The H900 condition is ideal for achieving the maximum strength of 630 stainless steel fittings.
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Corrosion resistance in chloride or sour service environments?
- 630 stainless steel fittings offer excellent corrosion resistance in chloride and sour service environments, making them suitable for oil & gas and chemical processing.
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NACE MR0175 / ISO 15156 compliance?
- Yes, 630 stainless steel fittings comply with NACE MR0175 and ISO 15156 for sour service applications.
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Minimum order quantity?
- The minimum order quantity for 630 stainless steel fittings is typically 10 pieces.
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Lead time for Sch 80 buttweld 630 elbows?
- Lead time for Sch 80 buttweld 630 elbows is typically 2–4 weeks.
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Can 630 fittings be polished to mirror finish?
- Yes, 630 stainless steel fittings can be polished to a mirror finish.
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Is 630 fittings suitable for cryogenic applications?
- Yes, 630 stainless steel fittings are suitable for cryogenic applications in low-temperature environments.
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Typical applications in oil & gas?
- 630 stainless steel fittings are commonly used for wellhead fittings, pump shafts, and valve trim in oil & gas applications.
Conclusion + Urgent Call-to-Action
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