Alloy 304/304H Pipe & Fittings

Stainless Steel 304H Alloy Pipe

Alloy 304/304H (UNS S30409) Alloy Pipe, Buttweld, & Flanges

Alloy 304/304H stainless steel Type 304/304H  is a modification of Type 304 with carbon content controlled in the range of 0.04 to 0.10 for increased strength at temperatures above approximately 800 degrees F. Unlike 304L, Type 304H with a higher carbon content makes the steel more suitable for use in higher-temperature applications.

It is an austenitic chromium-nickel steel alloy and the greater carbon content delivers an increased tensile and yield strength.

The material is recommended for use in ASME pressure vessels in working service above approximately 1000 degrees F due to the grade’s heat-resistant properties. It is common for it to be dual-certified as 304/304H when the material meets the higher carbon and grain size requirements. The producer of the steel must certify the material as Type 304H if it is to be used as this type instead of Type 304.

This type is most commonly used in petroleum refineries. It is also found in boilers. Other applications include heat exchangers, condensers, pipelines, cooling towers, steam exhausts, and electric generation plants. On occasion, it will also be found in fertilizer and chemical plants.

Type 304/304H can be supplied to meet AMS, ASTM, ASME, QQS, and MIL-S specifications.


Type 304H stainless is suitable for high-temperature applications as it offers higher strength at temperatures above about 1000° F (550° C) and up to 1500° F (800° C.)

  •  Stainless Steel Type 304H offers good oxidation resistance in intermittent service to 1600°F (870° C) and in continuous service to 1700° F (925° C)
  • Becomes sensitized in the temperature range of 800 – 1600° F (425-860° C); thus, Type 304H is not recommended if aqueous corrosion resistance is required and the product has either been welded or operates in the sensitization range.
  • Recommended hot forging/forming temperatures of 2000 – 2300° F
  • Pipes or tubes should be annealed between 1900° F and 2200° F
  • The material should be water quenched or rapidly cooled from the annealing temperature
  • This grade is quite ductile and forms easily
  • Cold forming increases the strength and hardness of the grade
  • Cold forming may make Alloy slightly magnetic
  • Higher carbon content gives the material greater strength at high temperature
  • The higher carbon results in greater tensile and yield strength
  • The higher carbon results in greater short and long-term creep strength

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High Nickel Alloy and Specialty Stainless Piping Material Service Center

Alloy 200/201 Pipe & Fittings

Nickel 200 (UNS  NO2200) is commercially pure (99.6%) wrought nickel. It has excellent mechanical properties and is highly resistant in myriad corrosive environments. Both Nickel 200 and 201 are approved for construction of pressure vessels and components under ASME Boiler and Pressure Vessel Code Section VIII, Division 1. Nickel 200 can be used to reduce the development of passive oxide films in highly oxidative media.

High Nickel Alloy and Specialty Stainless Piping Material Service Center

Alloy 400 Pipe & Fittings

Monel® Alloy 400 (UNS N04400) is a solid solution Alloy that may be hardened only by cold working. It has high strength and toughness over a wide temperature range and excellent resistance to many corrosive environments. Alloy 400 is virtually immune to chloride-ion stress corrosion cracking in typical environments.

High Nickel Alloy and Specialty Stainless Piping Material Service Center

Alloy 825 Pipe & fittings

Incoloy® Alloy 825 (UNS N08825) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The alloy’s chemical composition is designed to provide exceptional resistance to many corrosive environments. The nickel content of Alloy 825 is sufficient for resistance to chloride-ion stress corrosion cracking.

Incoloy Alloy 020 Nickel-Iron-Chromium Pipe

Ways To Use Alloy 20 Nickel Piping

Incoloy® Alloy 20 (UNS N08020) is an austenitic nickel-iron-chromium Alloy with additions of copper and molybdenum. The nickel content makes Alloy 20 resistant to chloride-ion stress-corrosion cracking. Copper and molybdenum give resistance to reducing environments. The molybdenum content also provides good resistance to pitting and crevice corrosion.

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