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Grade | C | SI | Mn | Cr | Ni | S | P |
304 | ≤ 0.08 | ≤1.00 | ≤2.00 | 18.00-20.00 | 8.00-11.00 | ≤0.03 | ≤0.045 |
304L | ≤0.035 | ≤1.00 | ≤2.00 | 18.00-20.00 | 8.00-13.00 | ≤0.03 | ≤0.045 |
304H | 0.04-0.10 | ≤1.00 | ≤2.00 | 18.00-20.00 | 8.00-11.00 | ≤0.03 | ≤0.045 |
Material | Tensile Strength ksi(MPa) | Yield Strength ksi(MPa) | Elongation (%) | Hardness Brinell/Vickers | Hardness Rockwell |
304 | ≥75(515) | ≥30(205) | ≥ 35 | ≤192HBW/200HV | ≤90HRB |
304L | ≥70(485) | ≥25(170) | ≥ 35 | ≤192HBW/200HV | ≤90HRB |
304H | ≥75(515) | ≥30(205) | ≥ 35 | ≤192HBW/200HV | ≤90HRB |
Stainless steel 304H seamless pipes have various applications in various industries, from food processing to automotive manufacturing. The pipes are highly resistant to corrosion and can withstand high temperatures and pressures, making them ideal for handling chemicals, fuels, and other liquids. With their aesthetic appeal and durability, stainless steel 304H seamless pipes are a popular choice for a variety of applications around the world.
Food Processing:
304H seamless pipes are commonly used in food processing due to their hygiene standards and corrosion resistance. The pipes transport food products like milk, beer, and juices. The smooth surface of the pipes helps prevent the growth of bacteria and other microorganisms.
Chemical Processing:
In chemical manufacturing, 304H seamless pipes transport chemicals and acids at high temperatures and pressures. The pipes are highly corrosion-resistant, making them ideal for handling corrosive chemicals.
Oil and Gas Industry:
The oil and gas industry heavily relies on stainless steel 304H seamless pipes due to their high resistance to corrosion and heat. The pipes transport oil and gas at high temperatures and pressures and resist cracking and leaks.
Architectural Applications:
The aesthetic appeal of stainless steel 304H seamless pipes makes them perfect for architectural applications, such as handrails and guardrails. The pipes are highly corrosion-resistant and can withstand harsh weather conditions, making them popular for outdoor installations.
Pharmaceutical Industry:
The pharmaceutical industry requires high levels of hygiene and cleanliness. SS 304H seamless pipes manufacture pharmaceutical products like vaccines and medications. The pipes offer high resistance to corrosion, making them suitable for handling chemicals in the manufacturing process.
Marine Applications:
304H Stainless steel seamless pipes are highly corrosion-resistant, making them ideal for marine applications. The pipes transport water, oil, and other liquids on ships and offshore rigs. They can withstand extreme weather conditions and exposure to seawater without rusting or corroding.
Automotive Industry:
The automotive industry has strict requirements for materials used in its manufacturing processes. Stainless steel 304H seamless pipes are commonly used to manufacture exhaust systems due to their corrosion-resistant properties. The pipes are also used for fuel and brake lines in cars and trucks.
End of Pipe and Tube
Ply Wooden Boxes
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Standard seaworthy export packing
Plastic Bags, or as required
Marking
Supplier / Manufacturer Name or Custom Logo - on request
Specification
Material Grade
Nominal Size
Schedule or Wall Thickness
Method of Manufacturing (Seamless or Welded)
Heat Number
Marked Pipe Sample: XTD ASTM A312 TP304H SEAMLESS 42.2x 3.56*6000MM HEAT NO. 2023121205A15
Packing
Ply Wooden Boxes
PE Fabric Bundles
Standard seaworthy export packing
Plastic Bags, or as required
Delivery Condition
Pickled&Annealed, Polished, Bright Annealed.
All tubes shall be supplied as per applicable ASTM B163 /B426
Mill test certificates will be issued
We can provide 3.2 Certification according to the needs of you
Standard
ASTM A312: Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
ASTM A213: Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
The stainless steel alloys AISI 304 and AISI 304L are the best known and most widely used chromium-nickel steels. Their excellent corrosion resistance, high strength and low carbon content make these austenitic steels particularly suitable for applications requiring welding.
304, 304H and 304L all possess the same nominal chromium and nickel content and thus possess the same corrosion resistance, ease of fabrication and weldability. The difference between 304, 304H and 304L is the carbon content which is >0.03, >0.05 and <0.03 respectively.
The carbon content of 304H (UNS S30409) is restricted to 0.04–0.10%, which provides optimal high temperature strength.
The carbon content of 304L (UNS 30403) is restricted to a maximum of 0.03%, which prevents sensitization during welding.
The carbon content of 304 (UNS 30400) is restricted to a maximum of 0.08%. Thus 304 is not useful for corrosive applications where welding is required such as tanks and pipes where corrosive solutions are involved, thus, 304L is preferred. And its lack of a minimum carbon content is not ideal for high temperature applications where optimal strength is required, thus, 304H is preferred. Thus 304 is typically restricted to bars that will be machined into components where welding is not required or thin sheets that are formed in articles such as kitchen sinks or cookware that are also not welded.
Carbon content has a strong influence on room temperature strength and thus the specified minimum tensile properties of 304L are 5 kilopounds per square inch (34 MPa) lower than for 304 (515 MPa). However, nitrogen also has a strong influence on room temperature strength and a tiny addition of nitrogen produces 304L with the same tensile strength as 304. Thus, practically all 304L is produced as dual certified 304/304L, meaning it meets the minimum carbon content of 304L and also meets the minimum tensile strength of 304.
