ASTM A333 Grade 7 Standard covers seamless and welded steel pipe for low temperature service. The ASTM A333 Grade 7 steel involved is similar to AISI 4032 low alloy steel. ASTM A333 Grade 7 pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. ASTM A333 Grade 7 covers seamless and welded steel pipe for low temperature service. The Grade 7 alloy steel involved is similar to AISI 4032 low alloy steel.
Seamless and Welded Steel Pipe size for Low-Temperature Service:
- Outer Dimensions: 19.05mm – 114.3mm
- Wall Thickness: 2.0mm – 14 mm
- Length: max 16000mm
Application: Seamless and Welded Steel Pipe for Low-Temperature Service.
Steel grade: ASTM A333 Grade 7, ASME SA333 Gr.7
Packing:
Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.Inspection and Test: Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test,No-destructive Test, Hydrostatic Test.
Surface treatment: Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.
Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.
ASTM A333 Grade 7 Chemical Compositions(%)
| Compositions | Data |
| Carbon(max.) | 0.19 |
| Manganese | 0.9 |
| Phosphorus(max.) | 0.025 |
| Sulfur(max.) | 0.025 |
| Silicon | 0.13-0.32 |
| Nickel | 2.03-2.57 |
| Chromium | … |
| Other Elements | … |
Mechanical properties for ASTM A333 Grade 7 Alloy Steel
| Properties | Data |
| Tensile strength, min, (MPa) | 450Mpa |
| Yield strength, min, (MPa) | 240 Mpa |
| Elongation, min, (%), L/T | 30/16.5 |
Impact requirements:
the notched-bar impact properties of each set of three impact specimens, when tested at temperature specified shall be not less than the values prescribed.Referenced Documents
- ASTM A 370 Test Methods and Definitions for Mechanical testing of Steel Products
- ASTM A999/A 999M Specification for General requirements for Alloy and Stainless Steel Pipe.
- ASTM A 671 Specification for General requirements for Alloy and Stainless Steel Pipe
- ASTM E 23 Test Methods for Notched bar Impact testing of Metallic Materials
