Sanmac® 316/316L
UNS S31600/S31603 | EN1.4401/1.4404 | ASTM 316 / 316L
| Item | Outside Diameter, mm | Inside diameter, mm | Stock |
|---|---|---|---|
| THB-SANMAC316L-32-16 | 32 | 16 | |
| THB-SANMAC316L-32-20 | 32 | 20 | |
| THB-SANMAC316L-36-16 | 36 | 16 | |
| THB-SANMAC316L-36-20 | 36 | 20 | |
| THB-SANMAC316L-36-25 | 36 | 25 | |
| THB-SANMAC316L-40-20 | 40 | 20 | |
| THB-SANMAC316L-40-25 | 40 | 25 | |
| THB-SANMAC316L-40-28 | 40 | 28 | |
| THB-SANMAC316L-45-20 | 45 | 20 | |
| THB-SANMAC316L-45-28 | 45 | 28 | |
| THB-SANMAC316L-45-32 | 45 | 32 | |
| THB-SANMAC316L-50-25 | 50 | 25 | |
| THB-SANMAC316L-50-32 | 50 | 32 | |
| THB-SANMAC316L-50-36 | 50 | 36 | |
| THB-SANMAC316L-56-28 | 56 | 28 | |
| THB-SANMAC316L-56-36 | 56 | 36 | |
| THB-SANMAC316L-56-40 | 56 | 40 | |
| THB-SANMAC316L-63-32 | 63 | 32 | |
| THB-SANMAC316L-63-36 | 63 | 36 | |
| THB-SANMAC316L-63-40 | 63 | 40 | |
| THB-SANMAC316L-63-45 | 63 | 45 | |
| THB-SANMAC316L-63-50 | 63 | 50 | |
| THB-SANMAC316L-71-36 | 71 | 36 | |
| THB-SANMAC316L-71-40 | 71 | 40 | |
| THB-SANMAC316L-71-45 | 71 | 45 | |
| THB-SANMAC316L-71-56 | 71 | 56 | |
| THB-SANMAC316L-75-40 | 75 | 40 | |
| THB-SANMAC316L-75-50 | 75 | 50 | |
| THB-SANMAC316L-75-60 | 75 | 60 | |
| THB-SANMAC316L-80-40 | 80 | 40 | |
| THB-SANMAC316L-80-45 | 80 | 45 | |
| THB-SANMAC316L-80-50 | 80 | 50 |
About
Sanmac® 316/316L is a molybdenum-alloyed austenitic chromium-nickel steel with improved machinability.
Standards
- ASTM: MT 316, MT 316L
- UNS: S31600, S31603
- EN Number: 1.4401, 1.4404
- EN Name: X 5 CrNiMo 17-12-2, X 2 CrNiMo 17-12-2
- JIS: SUS316TKA
Product standards
- 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 | Mo |
|---|---|---|---|---|---|---|---|
| ≤0.030 | ≤0.75 | ≤2.00 | ≤0.040 | ≤0.030 | 16.5 | 11 | 2.1 |
Applications
Sanmac® 316/316L is used for a wide range of industrial applications where steels of type ASTM 304/304L have insufficient corrosion resistance. Typical applications are:
- Machined parts for tube and pipe fittings
- Components for valves, 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® 316/316L has good resistance to:
- Organic acids at high concentrations and temperatures, with the exception of formic acid and acids with corrosive contaminants
- Inorganic acids, e.g. phosphoric acid, at moderate concentrations and temperatures, and sulfuric acid below 20% at moderate temperatures.
The steel can also be used in sulfuric acid of concentrations above 90% at low temperature. - E.g. sulfates, sulfides and sulfites
- Caustic environments
Intergranular corrosion
Sanmac® 316/316L has a low carbon content and therefore good resistance to intergranular corrosion.
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® 2205 have higher resistance to stress corrosion cracking than 316L.
Pitting and crevice corrosion
Resistance to these types of corrosion improves with increasing molybdenum content. Thus, the molybdenum-alloyed Sanmac® 316/316L has substantially higher resistance to attack than steels of type AISI 304 and 304L.
Gas corrosion
Sanmac® 316/316L can be used in:
- Air up to 850°C (1560°F)
- Steam up to 750°C (1380°F)
Creep behavior should also be taken into account when using the steel in the creep range. In flue gases containing sulfur, the corrosion resistance is reduced. In such environments the steel can be used at temperatures up to 600-750°C (1110-1380°F) depending on service conditions. Factors to consider are whether the atmosphere is oxidizing or reducing, i.e. the oxygen content, and whether impurities such as sodium and vanadium are present.
Forms of supply
Hollow bar-Finishes, dimensions and tolerances
Hollow bar Sanmac® 316/316L is stocked in a large number of sizes up to 250 mm outside diameter in the solution-annealed and white-pickled condition.
See catalogue S-110-ENG or S-1492-ENG.
Dimensions are given as outside and inside diameter with guaranteed component sizes after machining.
Outside diameter +2 / -0 %, but minimum +1 / -0 mm
Inside diameter +0 / -2 %, but minimum +0 / -1 mm
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.