What is ASTM A479 Type 304 material?
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What is ASTM A479?
ASTM A479 is a standard specification from the American Society for Testing and Materials (ASTM) that covers the composition and mechanical properties of stainless steel bars and shapes intended for use in the construction of boilers and other pressure vessels.
What is A479 304 material?
ASTM A479 304 is a stainless steel alloy specified by ASTM International Standard for bars and shapes used in boilers and other pressure vessels. Grade 304 has an austenitic structure, which allows for high-strength deep drawing without any intermediate annealing. ASTM A479 forged bars are corrosion-resistant and can withstand alkaline solutions. Therefore, they are often used in chloride-containing and acidic environments.
ASTM A479 304 Stainless Steel Round, Bright, Hex, Threaded Bar Chemical Composition
| C | Mn | Si | P | S | Cr | Ni | N | |
|---|---|---|---|---|---|---|---|---|
| 304 | 0.07max | 2.0max | 0.75max | 0.045max | 0.03max | min: 18.0 max: 20.0 | min: 8.0 max: 10.5 | |
| 304l | 0.03max | 2.0max | 0.75max | 0.045max | 0.03max | min: 18.0 max: 20.0 | min: 8.0 max: 12.0 | 0.10 max |
| 304h | min: 18.0 max:20.0 | min: 8.0 max: 10.5 | min: 0.04 max:0.10 | 0.75 max | 2.0 max | 0.045 max | 0.03 max | 0.10 max |
A479 304 Round Bar Mechanical and Physical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 304 | 515 | 205 | 40 | 92 | 201 |
| 304L | 485 | 170 | 40 | 92 | 201 |
| 304H | 515 | 205 | 40 | 92 | 201 |
aSTM A479 304 Round Bar Physical Properties
| Grade | Density(kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 304/L/H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |
What is the difference between ASTM A276 tp304 and ASTM A479 tp304?
The main difference is application and material requirements, with ASTM A276 covering general-purpose bars and shapes, while ASTM A479 specifically covers bars and shapes intended for use in boilers and other pressure vessels. While both specify the same grades like TP304 stainless steel, the A479 standard includes additional requirements to ensure the material can safely handle the high pressures, temperatures, and corrosive environments found in pressure vessel applications.
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ASTM A479 Round Bar specification
| Specification | EN 10272, EN 10088-3 |
|---|---|
| Standard | ASME, EN, UNS, AISI, GB, DIN, SUS, API, ASTM |
| Sizes | 3mm to 800mm diameter |
| Length |
12 Random Lengths Long Bars: 15-20 Random Lengths |
| Finish | Centreless Ground, Black, Bright, Rough Turned, Peeled, Bright Drawn, Polished, Cold Drawn Turned, Grinding, Annealed, Smooth Turned |
| Tolerances | H8, H13, H12, H9, H11, K12, H10, K10, K11, K9 |
| Surface Finish | NO.1, NO.3, 2B, 1D, NO.4, 2D, BA, HL, 8K |
| Production Method | Rolled / Forged |
