Austenitic & Super Austenitics Steels
TP 304 • UNS S30400 • 1.4301/1.4307
Alloys 304 (S30400) and 304L (S30403) stainless steels are variations of the 18 percent chromium – 8 percent nickel austenitic alloy, the most familiar and most frequently used alloy in the stainless steel family.
High strength, excellent corrosion resistance and minimized carbon content make Alloy 304 and 304L Stainless Steels useful for applications where welding is required. Uses include architectural mouldings and trim, welded components of chemical, textile, paper, pharmaceutical and chemical industry processing equipment.
Other advantages are its resistance to oxidation, excellent formability, ease of fabrication and cleaning, excellent strength to weight ratio and good toughness at cryogenic temperatures For severely corrosive environments, the lower content of Type 304L is preferred because of its greater immunity to intergranular corrosion
- Typical manufacturing specifications
ASTM A213, ASTM A269, ASTM A312, ASTM A632 Also individual customer specifications.
- Industries predominantly using this grade
Moisture separator reheaters, Heat Exchangers, Feedwater tubes etc.
Technical Data
Chemical composition(% by Weight)
Element | C | Mn | P | S | Si | Ni | Cr |
|---|---|---|---|---|---|---|---|
Minimum | - | - | - | - | - | 8.0 | 18.0 |
Maximum | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 11.0 | 20.0 |
Aiming | 0.01 | 1.6 | 0.03 | 0.003 | 0.5 | 9.1 | 18.1 |
Mechanical Properties
| Specifications(Tubing, Annealed) | Actual data | |||
|---|---|---|---|---|
|
Tensile Rm |
75 |
ksi (min.) |
81 ~ 101 |
ksi |
|
Tensile Rm |
515 |
MPa (min.) |
560 ~ 700 |
MPa |
|
Yield (R.p. 0.2%) |
30 |
ksi (min.) |
36 ~ 50 |
ksi |
|
Yield (R.p. 0.2%) |
205 |
MPa (min.) |
250 ~ 350 |
MPa |
|
Elongation |
35 |
% (min.) |
45 ~ 55 |
% |