Introduction of Austenitic Stainless Steel
Min Hwei specializes in manufacturing Stainless Steel Fasteners which are mainly
used 300 series Austenitic Stainless Steel as raw materials. The standard chemical
composition of this type of Stainless Steel is 18%(Cr) and 8%(Ni), thus it is also
popularly known as 18-8 Stainless Steel - a kind of superior metal material which
conforms to environmental protection.
Physical Properties of Austenitic Stainless Steel
The Austenitic Stainless Steel possess excellent properties of corrosion
resistibility and cold-working ability. In low-temperature condition, it maintains
the ability of extension and impact-resistibility which prevent embrittlement and
phase change from happening; even in high-temperature condition, the embrittlement
is also seldom occurred. Besides, since the Austenitic Stainless Steel can't be
hardened by heat treatment, it needs to be done through cold work to enhance its
hardness and strength.
The Austenitic Stainless Steel is non-magnetic under normal status, but it will
trun to be slightly-magnetic after cold work.
Application Index of Stainless Steel in Different Circumstances
Application of Austenitic Stainless Steel
It's mainly applied in Petrochemical industry, Chemical industry, Food processing
industry, Machinery industry, Building materials and Marine facilities... Etc.
The Requirements of Chemical Composition
Chemical Requirements(Ref. ASTM A493)
| Alloy Group |
UNS Designation |
Alloy | Composition, %Maximum Except as Shown | |||||||||
| C | Mn | P | S | Si | Cr | Ni | Cu | Mo | Other | |||
| 1 | S30400 | 304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 to 20.0 | 8.0 to 10.5 | 1.00 | ||
| 1 | S30403 | 304 L | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0 to 20.0 | 8.0 to 12.0 | 1.00 | ||
| 1 | S30430 | XM7 | 0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0 to 19.0 | 8.0 to 10.0 | 3.0 to 4.0 | ||
| 2 | S31600 | 316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0 to 18.0 | 10.0 to 14.0 | 2.00 to 3.00 | ||
| 2 | S31603 | 316 L | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0 to 18.0 | 10.0 to 14.0 | 2.00 to 3.00 | ||
Chemical Requirements(Ref. DIN EN ISO 3506)
| Alloy Group |
Grade | Chemical Composition %(m/m) |
Notes | ||||||||
| C | Si | Mn | P | S | Cr | Mo | Ni | Cu | |||
| Austenitic | A2 | 0.1 | 1 | 2 | 0.05 | 0.03 | 15 to 20 | a. | 8 to 19 | 4 | b.c. |
| A4 | 0.08 | 1 | 2 | 0.045 | 0.03 | 16 to 18.5 | 2 to 3 | 10 to 15 | 1 | c.d. | |
a. Molybdenum may be present at the discretion of the manufacturer. However,
if for some applications limiting of the molybdenum content is essential,
this must be stated at the time of ordering by the purchaser.
b. If the chromium content is below17%, the minimum nickel content should be12%.
c. For Austenitic Stainless Steels having a maximum carbon content of 0.03%,
nitrogen may be present to a maximum of 0.22%.
d. At the discretion of the manufacturer the carbon content may be higher where
required to obtain the specified mechanical properties at larger diameters, but
shall not exceed 0.12% for Austenitic Steels.