Home > Forged Fittings > Stainless Steel 348/348H Forged Fittings
Nakamura Stainless, located in Pulau Ujong, Singapore, is a well-known maker and supplier of high-quality stainless steel products, including stainless steel 348 and 348H forged fittings. These fittings are designed for high-temperature and corrosive environments. They offer excellent resistance to intergranular corrosion and thermal fatigue. Stainless steel 348 and its high-carbon variant, 348H, are stabilized with niobium. This gives them improved creep strength and durability when exposed to heat for long periods. Nakamura Stainless ensures precise forging and strict quality control, delivering reliable fittings for critical applications in power plants, petrochemical industries, and heat exchanger systems.
Stainless steel 348/348H forged fittings are made from an austenitic stainless steel alloy that contains about 17 to 19% chromium, 9 to 13% nickel, and niobium (columbium) for stabilization. The 348H grade has a higher carbon content, which enhances high-temperature strength and creep resistance. These fittings have tensile strengths from 550 to 750 megapascals and maintain their mechanical integrity at temperatures above 800°C. Niobium stabilizes the alloy, preventing carbide precipitation during welding or thermal cycling. This ensures excellent resistance to intergranular corrosion and oxidation in challenging environments.
| STANDARD | Stainless Steel 348/348H Forged Fittings |
| EN | X5CrNiMo17-12-2 / X3CrNiMo17-13-3 |
| JIS | SUS 316L |
| BS | 316S11 / 316S13 |
| UNS | S31603 |
| WERKSTOFF NO. | 1.4404 / 1.4435 |
| AFNOR | Z7CND17‐11‐02 |
| GOST | 03Ch17N14M3 / 03Ch17N14M2 |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| SS 348/348H | 0.08 max | 2 max | 0.75 max | 0.045 max | 0.030 max | 18 – 20 | – | 8 – 10 | – |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
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At Nakamura Stainless, all stainless steel 348/348H forged fittings are rigorously tested to ensure they meet international quality standards. Each product is tested for durability, corrosion resistance and high temperature performance. Accredited by recognized authorities, we issue Material Testing Reports (MTRs) for our fittings, ensuring reliability and customer confidence with every purchase.
Corrosion-resistant and ideal for high-temperature applications, these fittings provide robust, leak-proof connections. Common sizes range from ½” to 4″ in diameter. Socket weld fittings are used in industries like chemical processing and petrochemicals for their strength and reliability.
Offering excellent corrosion resistance, these fittings are designed for high-stress and high-temperature applications. Available sizes typically range from ¼” to 2″ in diameter. They ensure secure and leak-free connections and are ideal for use in oil and gas industries.
Highly resistant to corrosion, this elbow facilitates changes in direction with a 45-degree bend. Standard sizes range from ½” to 4″ in diameter. It redirects its flow in pipelines, especially in chemical and petrochemical industries.
Featuring superior corrosion resistance, this tee allows for branching off a main line. Sizes generally range from ¼” to 2″ in diameter. They are commonly used in high-temperature and high-pressure environments, ensuring durability and reliability in critical applications.
Known for its corrosion resistance, this half coupling is used to join pipes or tubes of the same diameter. Typical sizes range from ¼” to 2″ in diameter. It is essential for creating extensions or connections in industrial piping systems.
Corrosion-resistant and durable, this cross-fitting allows four-way connections in piping systems. Available in sizes from ½” to 4″ in diameter. It’s used in complex pipeline networks to facilitate multiple branch connections, especially in chemical and petrochemical industries.
Stainless steel 348/348H forged fittings are commonly used in high-temperature piping and pressure systems that require durability, corrosion resistance, and thermal stability. Typical applications include steam lines, boilers, heat exchangers, pressure vessels, and chemical processing plants. Their outstanding performance in welded structures and resistance to thermal fatigue make them suitable for power generation, petrochemical, and refinery sectors. These fittings provide secure, long-lasting connections in harsh operating conditions, ensuring safety and reliability in critical infrastructure.
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