ASTM A358 TP 316H is a specification established by the American Society for Testing and Materials (ASTM) that pertains to electric fusion welded (EFW) pipes made from stainless steel grade 316H. Stainless steel 316H is a high carbon variation of the widely used stainless steel 316, which offers enhanced high-temperature strength and corrosion resistance. The "TP" in the specification stands for "tube and pipe," indicating its focus on tubular products. Electric fusion welding involves the joining of two pieces of metal using an electric arc that melts the edges and forms a welded joint. This method ensures a strong and reliable connection between the pieces, making it suitable for various applications, including industries like petrochemical, chemical, and power generation, where corrosion resistance and high-temperature performance are crucial.
The ASTM A358 TP 316H standard outlines the specific requirements for the manufacturing process, chemical composition, mechanical properties, dimensions, and tolerances of the EFW pipes. It covers parameters such as diameter, wall thickness, straightness, and more, ensuring uniformity and consistency in the produced pipes. The pipes are typically offered in various sizes, schedules, and lengths to accommodate different project requirements. Stainless steel 316H is known for its increased carbon content, which provides improved high-temperature strength compared to its counterpart 316. This makes it suitable for applications involving elevated temperatures, such as in heat exchangers, boilers, and furnace components. The alloy's corrosion resistance properties are also preserved, making it appropriate for use in corrosive environments.
In summary, ASTM A358 TP 316H stainless steel EFW pipes are fabricated according to the ASTM A358 standard using grade 316H stainless steel. These pipes are employed in industries where resistance to both high temperatures and corrosion is imperative. The standard ensures that the pipes adhere to specific criteria regarding manufacturing, chemical composition, dimensions, and mechanical properties, guaranteeing their suitability for a range of demanding applications.
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Specification:
| Property | Specification |
| Standard | ASTM A358 |
| Material Grade | TP 316H Stainless Steel |
| Manufacturing Method | Electric Fusion Welding (EFW) |
| Size Range | NPS 1/8" - 30" |
| Schedule | 5S, 10S, 40S, 80S, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXH |
| Length | Random or Specific Cut Lengths |
| Straightness Tolerance | 1/8 inch in 10 feet |
| Wall Thickness Tolerance | ±12.5% |
| Hydrostatic Test | Required |
| Nondestructive Test | Eddy Current or Ultrasonic Test |
| Heat Treatment | Annealing or Solution Annealing |
Chemical Composition of ASTM A358 TP 316H STAINLESS STEEL EFW PIPE
| Element | Composition Range (%) |
| Carbon (C) | 0.04 - 0.10 |
| Silicon (Si) | 0.75 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 16.00 - 18.00 |
| Nickel (Ni) | 10.00 - 14.00 |
| Molybdenum (Mo) | 2.00 - 3.00 |
| Nitrogen (N) | 0.10 max |
Mechanical Properties of ASTM A358 TP 316H STAINLESS STEEL EFW PIPE
| Property | Minimum Value |
| Tensile Strength | 75 ksi (515 MPa) |
| Yield Strength | 30 ksi (205 MPa) |
| Elongation | 35% min |
| Hardness (Brinell) | 217 max |
| Hardness (Rockwell B) | 95 max |
| Impact Toughness | To be specified |
Advantages of ASTM A358 TP 316H STAINLESS STEEL EFW PIPE
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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