SS 410 / 420
SS 410 / 420: Specifications | Grades & Standards | Product Types | Equivalent | Chemical | Mechanical | BW Fittings | Forged Fittings | Flanges | FAQ
Top Exporters, Manufacturers & Suppliers of Stainless Steel 410 Pipe Fittings, 420 Flanges, 410 SS Forged Fittings, SS 410 / 420 Buttweld Elbows, Tees, Reducers, UNS S41000 / S42000 Pipe Fittings & Flanges – ASTM A182 / A403 Certified, Heat-Resistant, Corrosion-Resistant, and High-Strength Piping Solutions Exported to UAE, Saudi Arabia, Singapore, Germany, and South Africa.
Best Export Prices: sales@midlandforgefittings.com
Midland Forge and Fittings Pvt. Ltd. specializes in manufacturing and supplying high-quality SS 410 and SS 420 pipe fittings, flanges, and forged components designed for exceptional strength, durability, and corrosion resistance. These martensitic stainless steel grades are engineered to perform reliably in demanding environments such as oil & gas, petrochemical, power generation, and marine industries.
With advanced production capabilities and strict compliance with ASTM and ASME standards, the company delivers precision-engineered SS 410 / 420 piping solutions that ensure excellent heat resistance, mechanical strength, and dimensional accuracy—trusted worldwide for high-performance applications.
SS 410 / 420 pipe fittings and flanges are martensitic stainless steel components designed for applications requiring high mechanical strength, hardness, and moderate corrosion resistance. These alloys are primarily composed of chromium (11.5–14.0%) with controlled carbon levels, enabling excellent wear resistance and oxidation resistance up to approximately 650°C. SS 410 offers good tensile and yield strength after proper heat treatment, while SS 420 provides superior hardness and edge retention due to its higher carbon content.
Both grades exhibit magnetic properties in all conditions and are typically supplied in hardened and tempered states. They demonstrate good machinability and can be welded using preheating and post-weld heat treatment to minimize cracking. SS 410 / 420 fittings and flanges are ideal for high-temperature and high-pressure systems, valves, pumps, turbine blades, and steam piping applications where strength and oxidation resistance are essential.
UNS S41000 / S42000 pipe fittings - Specifications
Stainless steel 410 forged fittings – Grades & Standards
| Material / Grade |
UNS | ASTM / ASME Standard |
Product Type | Typical Applications |
|---|---|---|---|---|
| SS 410 | S41000 | ASTM A182 / A182M (Forged & Flanges), ASTM A403 / A403M (Buttweld Fittings) |
Forged Fittings, Flanges, Buttweld Fittings | Valves, Pumps, Turbine Blades, Steam Piping, Heat Exchangers |
| SS 420 | S42000 | ASTM A182 / A182M (Forged & Flanges), ASTM A403 / A403M (Buttweld Fittings) |
Forged Fittings, Flanges, Buttweld Fittings | High-Strength Valves, Pump Shafts, Turbine Blades, High-Wear Piping, Industrial Components |
SS 410, 420 Series – Industrial Flanges, Fittings & Piping Products
Stainless steel 420 fittings ASTM A403 - Equivalent Grades
| Grade | UNS | EN / DIN | JIS | GOST | BS | AFNOR |
|---|---|---|---|---|---|---|
| SS 410 | S41000 | X12Cr13 / 1.4006 | SUS410 | 12Х13 | 410S21 | Z12C13 |
| SS 420 | S42000 | X20Cr13 / 1.4021 | SUS420J1 / SUS420J2 | 20Х13 | 420S37 | Z20C13 |
ASTM A182 SS 410 flanges - Chemical Composition
| Element | SS 410 (UNS S41000 / EN 1.4006) | SS 420 (UNS S42000 / EN 1.4021) |
|---|---|---|
| Carbon (C) | 0.08 – 0.15% | 0.15 – 0.40% |
| Manganese (Mn) | ≤ 1.00% | ≤ 1.00% |
| Silicon (Si) | ≤ 1.00% | ≤ 1.00% |
| Phosphorus (P) | ≤ 0.040% | ≤ 0.040% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.030% |
| Chromium (Cr) | 11.5 – 13.5% | 12.0 – 14.0% |
| Nickel (Ni) | ≤ 0.75% | ≤ 0.75% |
| Molybdenum (Mo) | — | — |
| Iron (Fe) | Balance | Balance |
SS 410 / 420 seamless pipe fittings - Mechanical Properties
| Property | SS 410 (S41000 / X12Cr13) | SS 420 (S42000 / X20Cr13) |
|---|---|---|
| Tensile Strength (MPa) | 480 – 700 | 700 – 850 |
| Yield Strength (MPa) | 275 (min) | 500 (min) |
| Elongation (%) | 20 | 15 |
| Hardness (Brinell HB) | 170 – 200 | 200 – 250 |
| Impact Toughness (J at 20°C) | 40 – 50 | 35 – 45 |
| Density (g/cm³) | 7.75 | 7.75 |
| Melting Range (°C) | 1480 – 1530 | 1450 – 1510 |
| Modulus of Elasticity (GPa) | 200 | 200 |
| Magnetic Properties | Magnetic | Magnetic |
SS 410/420 Buttweld Fittings – Seamless, Welded & Fabricated Types
Types of Stainless Steel 410/420 Flanges for Piping Systems
Stainless Steel 410/420 Forged Fittings – Complete Guide
What are SS 410 and SS 420 pipe fittings and flanges made of?
SS 410 and SS 420 are martensitic stainless steels primarily composed of chromium and iron, with varying carbon content.
SS 410 (UNS S41000 / EN X12Cr13) contains approximately 11.5–13.5% chromium and 0.08–0.15% carbon, providing moderate corrosion resistance and good mechanical strength.
SS 420 (UNS S42000 / EN X20Cr13) has 12–14% chromium and 0.15–0.40% carbon, resulting in higher hardness, strength, and wear resistance.
These grades are heat-treatable, allowing for improved mechanical properties such as tensile strength and hardness.
How do SS 410 / 420 compare with austenitic grades like SS 304 or SS 316?
| Property | SS 410 / 420 | SS 304 / 316 |
|---|---|---|
| Structure | Martensitic | Austenitic |
| Magnetic | Yes | No |
| Hardness | High | Moderate |
| Ductility | Lower | Higher |
| Corrosion Resistance | Moderate | Excellent |
| Weldability | Moderate (requires preheat/PWHT) | Excellent |
| Temperature Limit | ~650°C | ~870°C |
Can SS 410 / 420 fittings and flanges be welded?
Yes, but with specific precautions due to their martensitic structure:
Preheating to 200–300°C before welding reduces thermal shock and cracking risk.
Low hydrogen electrodes are recommended.
Post-weld heat treatment (PWHT) at 650–750°C relieves stresses and restores ductility.
Avoid rapid cooling — use slow cooling to prevent the formation of hard and brittle martensite.
Welding filler metals such as AWS E410 or E420 are generally used.