ASTM A249 SUS310 Welded Tubing:
The ASTM A249 SUS310 Welded Tubing specification covers nominal-wall-thickness welded tubes and heavily cold worked welded tubes made from the austenitic steels. More specifically, the ASTM A249 specification is intended for uses such as:
Boiler
Superheater
heat exchanger
condenser tubes
be furnished in the heat-treated condition in accordance with the required solution temperature and quenching method. conform to the prescribed tensile and hardness properties such as tensile strength, yield strength, elongation, and Rockwell hardness number.
undergo mechanical tests such as tension test, flattening test, reverse-bend test, hardness test, and hydrostatic or nondestructive test.
Typical compositional ranges for ASTM A249 SUS310 Welded Tubing are given in table 1.
Table 1. Composition ranges for 304 grade stainless steel
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 310 | min. | - | - | - | - | - | 24.0 | - | 19.o | - |
| max. | 0.25 | 2.00 | 1.50 | 0.045 | 0.030 | 26.0 | - | 22.5 | - | |
| 310S | min. | - | - | - | - | - | 24.0 | - | 19.o | - |
| max. | 0.08 | 2.00 | 1.50 | 0.045 | 0.030 | 26.0 | - | 22.0 | - |
Mechanical Properties
Typical mechanical properties for grade 310 stainless steels are given in table 2
Table 2.Mechanical properties of 310 grade stainless steel
| 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 | ||||
| 310 | 515 | 205 | 40 | 95 | 217 |
| 310S | 515 | 205 | 40 | 95 | 217 |
Physical Properties
Typical physical properties for annealed grade 310 stainless steels are given in table 3.
Table 3.Physical properties of 310 grade stainless steel in the annealed condition
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (n.m) | |||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 310/S | 7750 | 200 | 15.9 | 16.2 | 17.0 | 14.2 | 18.7 | 500 | 720 |
Grade Specification Comparison
Approximate grade comparisons for 310 stainless steels are given in table 4.
Table 4.Grade specifications for 310 grade stainless steel
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
| BS | En | No | Name | ||||
| 310 | S31000 | 310S24 | - | 1.4840 | X15CrNi25-20 | - | SUH 310 |
| 31S | S31008 | 310S16 | - | 1.4845 | X8CrNi25-21 | 2361 | SUS 310S |
These comparisons are approximate only. The list is intended as a comparison of functionally similar materialsnotas a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted. | |||||||
Corrosion Resistance
Excellent in a wide range of atmospheric environments and many corrosive media. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C.
