Sanmac® 304/304L
UNS S30400/S30403 | EN1.4301/1.4307 | ASTM 304 / 304L
| Item | Outside Diameter, mm | Inside diameter, mm | Stock |
|---|---|---|---|
| THB-SANMAC304L-32-16 | 32 | 16 | |
| THB-SANMAC304L-32-20 | 32 | 20 | |
| THB-SANMAC304L-36-16 | 36 | 16 | |
| THB-SANMAC304L-36-20 | 36 | 20 | |
| THB-SANMAC304L-36-25 | 36 | 25 | |
| THB-SANMAC304L-40-20 | 40 | 20 | |
| THB-SANMAC304L-40-25 | 40 | 25 | |
| THB-SANMAC304L-40-28 | 40 | 28 | |
| THB-SANMAC304L-45-20 | 45 | 20 | |
| THB-SANMAC304L-45-28 | 45 | 28 | |
| THB-SANMAC304L-45-32 | 45 | 32 | |
| THB-SANMAC304L-50-25 | 50 | 25 | |
| THB-SANMAC304L-50-32 | 50 | 32 | |
| THB-SANMAC304L-50-36 | 50 | 36 | |
| THB-SANMAC304L-56-28 | 56 | 28 | |
| THB-SANMAC304L-56-36 | 56 | 36 | |
| THB-SANMAC304L-56-40 | 56 | 40 | |
| THB-SANMAC304L-63-32 | 63 | 32 | |
| THB-SANMAC304L-63-36 | 63 | 36 | |
| THB-SANMAC304L-63-40 | 63 | 40 | |
| THB-SANMAC304L-63-45 | 63 | 45 | |
| THB-SANMAC304L-63-50 | 63 | 50 | |
| THB-SANMAC304L-71-36 | 71 | 36 | |
| THB-SANMAC304L-71-40 | 71 | 40 | |
| THB-SANMAC304L-71-45 | 71 | 45 | |
| THB-SANMAC304L-71-56 | 71 | 56 | |
| THB-SANMAC304L-75-40 | 75 | 40 | |
| THB-SANMAC304L-75-50 | 75 | 50 | |
| THB-SANMAC304L-75-60 | 75 | 60 | |
| THB-SANMAC304L-80-40 | 80 | 40 | |
| THB-SANMAC304L-80-45 | 80 | 45 | |
| THB-SANMAC304L-80-50 | 80 | 50 |
About
Sanmac® 304/304L is an austenitic chromium-nickel steel with improved machinability.
Standards
- ASTM: MT 304, MT 304L
- UNS: S30400, S30403
- EN Number: 1.4301, 1.4307
- EN Name: X5CrNi18-10, X2CrNi18-9
- JIS: SUS304TKA
Product standards in applicable parts
- EN 10216-5*, EN 10297-2, EN 10294-2
- ASTM A511
- JIS G3446
* The leakage test is deferred to the finished component
Approval
JIS Approval No. SE9402 for Stainless Steel Tubes
Chemical composition (nominal) %
| C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| ≤0.030 | 0.4 | 1.3 | ≤0.040 | ≤0.030 | 18.5 | 9 |
Applications
Sanmac® 304/304L is used for a wide range of industrial applications. Typical examples are: Machined parts for tube and pipe fittings, valves, components for pumps, heat exchangers and vessels, different tubular shafts in chemical, petrochemical, fertilizer, pulp and paper and power industries as well as in the production of pharmaceuticals, foods and beverages.
Corrosion resistance
General corrosion
Sanmac® 304/304L has good resistance to:
- Organic acids at moderate temperatures, with the exception of formic acid
- Sulphates, sulphides and sulphites
- Caustic solutions at moderate temperatures
- Oxidizing acids like nitric acid
Stress corrosion cracking
Austenitic steels are susceptible to stress corrosion cracking. This may occur at temperatures above about 60°C (140°F) if the steel is subjected to tensile stresses and at the same time comes into contact with certain solutions, particularly those containing chlorides.
In applications demanding high resistance to stress corrosion cracking, the austenitic-ferritic steels SAF™ 2304, Alleima® 10RE51 or Sanmac® SAF™ 2205 have higher resistance to stress corrosion cracking than 304L.
Intergranular corrosion
Sanmac® 304/304L has a low carbon content and therefore good resistance to intergranular corrosion.
Pitting and crevice corrosion
The steel may be sensitive to pitting and crevice corrosion even in solutions of relatively low chloride content. Molybdenum-alloyed steels have better resistance and the resistance improves with increasing molybdenum content.
Forms of supply
Hollow bar- Finishes, dimensions and tolerances
Hollow bar in Sanmac® 304L is stocked in various sizes in the solution annealed and white-pickled condition. See catalogues S-110-ENG or S-02909-ENG.
Dimensions are given as outside and inside diameters with guaranteed component sizes after machining, see catalogues.
Outside diameter tolerance is +2/-0%, but minimum +1/-0mm
Inside diameter tolerance is +0/-2%, but minimum +0/-1mm
Straightness +/-1.5mm/m
Other tolerances can be supplied against special order
Other forms of supply
Bar
Steel with improved machinability, Sanmac®, is also available in bar.
Heat treatment
Hollow bar is delivered in heat treated condition. If further heat treatment is needed after further processing the following is recommended:
Stress relieving
850–950°C (1560–1740°F), cooling in air.
Solution annealing
1000–1100°C (1830–2010°F), rapid cooling in air or water.