Overview
Grade 304 is the standard"18/8"stainless, it is the most versatile and most widely used stainless steel, available in a wider range of products, forms and finishes than any other. It has excellent forming and welding characteristics.
ASTM A213 TP304 tube mostly used as superheater, boiler, heat exchanger tubes, it's made by an austenitic grade with the addition of 2% to 3% molybdenum which further improves corrosion resistance. And the sizes and thickness usually furnished to its specification are 1/8 inch (3.2 mm) in inside diameter to 5 inch (127 mm) in outside diameter and 0.015 to 0.500 inch (0.4 to 12.7 mm) inclusive, in minimum wall thickness. The tube has other diameters may be furnished, provided such tubes comply with all other requirements of this specification.
Specification
ASTM A213/A213M-21a Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
Chemical Composition
| GRADE | UNS | C | Mn | P | S | Si | Cr | Ni | Mo | Ti | Nb | N |
| TP304 | S30400 | 0.08 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 8.0-11.0 | - | - | - | - |
Mechanical Properties
| Material | Heat | Temperure | Tensile Strength | Yield Strength | Elongation %, Min |
| Treatment | Min.º F(º C) | Ksi (MPa), Min. | Ksi (MPa), Min. | ||
| TP304 | Solution | 1900 (1040) | 75(515) | 30(205) | 35 |
Material Grade
American Standard | Austenitic Steel: |
Europen Standard | 1.4301,1.4307,1.4948,1.4541,1.4878,1.4550,1.4401,1.4404,1.4571,1.4438, 1.4841,1.4845,1.4539,1.4162, 1.4462, 1.4362, 1.4410, 1.4501 |
Some of the quality tests carried out by us includes:
| Corrosion Test | Conducted only when specially requested by the client |
| Chemical Analysis | Test done as per required quality standards |
| Destructive / Mechanical Testing | Tensile | Hardness | Flattening | Flare | Flange |
| Reverse-bend and Re. flat tests | Carried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free expansion, welding & use at customers end |
| Eddy Current Testing | Done to detect homogeneities in subsurface by using Digital Flaw-mark Testing System |
| Hydrostatic Testing | 100% Hydrostatic Testing carried out according to ASTM-A 450 norms for checking tube leakage, and biggest pressure we can support 20Mpa/7s . |
| Air Under Pressure Test | To check any evidence of air leakage |
| Visual Inspection | After passivation, every single length of tubes & pipes is subjected to thorough visual inspection by trained staff for detecting surface flaws & other imperfections |
Applications
1. Heat exchangers (condensers, evaporators, sea water desalinators).
2. Chemical and petrochemical industries.
3. Food processing and refrigeration industries.
