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Standard: ASTM A249, ASTM A268, ASTM A269, ASTM A312, etc.
Material: 201,301,304,309S,310S,316,316L,316Ti,317L,317,321,347,201,202,etc.
Specification:
Outer diameter: 1.0-1220mm (1/8”-48”)
Wall thickness: 0.1-150mm (SCH 5S- XXS)
Length: 3m, 5.8m, 6m, 11.8m, or as request.
Surface: Pickled, annealed, polished, bright, sand blast, hair line, etc.
The reason for choosing stainless steel is normally due to advantages given by physical properties such as corrosion resistance.
In addition to corrosion resistance, the advantageous physical properties of stainless steel include:
High and low temperature resistance
Ease of fabrication
High Strength
Aesthetic appeal
Hygiene and ease of cleaning
Long life cycle
Recyclable
Low magnetic permeability
| Chemical composition of stainless steel | ||||||||||||
| standard name | chemical composition | |||||||||||
| ASTM | EN | GB | JIS | KS | C(carbon) | Si(silicon) | Mn(manganese) | Cr(chromium) | Ni(nickel) | S(sulfur) | P(phosphorus) | others |
| 201 | 1.4372 | 1Cr17Mn6Ni5N | SUS201 | STS201 | ≤0.15 | ≤1.0 | 5.5~7.5 | 16.0~18.0 | 3.5~5.5 | ≤0.030 | ≤0.060 | N:≤0.025 |
| 202 | 1.4373 | 1Cr18Mn8Ni5N | SUS202 | STS202 | ≤0.15 | ≤1.0 | 7.5~10.0 | 17.0~19.0 | 4.0~6.0 | ≤0.030 | ≤0.060 | N:≤0.025 |
| 301 | 1.4319 | 1Cr17Ni7 | SUS301 | STS301 | ≤0.15 | ≤1.0 | ≤1.0 | 17.0~18.0 | 6.0~8.0 | ≤0.200 | ≤0.020 | - |
| 304 | 1.4301 | 0Cr18Ni9 | SUS304 | STS304 | ≤0.08 | ≤1.0 | ≤2.0 | 17.0~19.0 | 8.0~11.0 | ≤0.030 | ≤0.035 | - |
| 321 | 1.4541 | 1Cr18Ni9Ti | SUS321 | STS321 | ≤0.12 | ≤1.0 | ≤2.0 | 17.0~19.0 | 8.0~11.0 | ≤0.030 | ≤0.035 | Ti:5C~7.0 |
| 304L | 1.4306 | 00Cr19Ni10 | SUS304L | STS304L | ≤0.03 | ≤1.0 | ≤2.0 | 18.0~20.0 | 8.0~12.0 | ≤0.030 | ≤0.035 | - |
| 309S | 1.4833 | 0Cr23Ni13 | SUS309S | STS309S | ≤0.08 | ≤1.0 | ≤2.0 | 22.0~24.0 | 12.0~15.0 | ≤0.030 | ≤0.035 | - |
| 310S | 1.4845 | 0Cr25Ni20 | SUS310S | STS310S | ≤0.08 | ≤1.0 | ≤2.0 | 24.0~26.0 | 19.0~22.0 | ≤0.030 | ≤0.035 | - |
| 316 | 1.4401 | 0Cr17Ni12Mo2 | SUS316 | STS316 | ≤0.08 | ≤1.0 | ≤2.0 | 16.0~18.0 | 10.0~14.0 | ≤0.030 | ≤0.035 | Mo:2.0~3.0 |
| 316L | 1.4404 | 00Cr17Ni14Mo2 | SUS316L | STS316L | ≤0.03 | ≤1.0 | ≤2.0 | 16.0~18.0 | 12.0~15.0 | ≤0.030 | ≤0.035 | Mo:2.0~3.0 |
Why Would You Want to Use 304L, Then?
So, if 304L is weaker than standard 304 stainless steel, why would anyone want to use it?
The answer is that the 304L alloy’s lower carbon content helps minimize/eliminate carbide precipitation during the welding process. This allows 304L stainless steel to be used in the “as-welded” state, even in severe corrosive environments.
If you were to use standard 304 stainless in the same way, it would degrade much faster at the weld joints.
Basically, using 304L eliminates the need to anneal weld joints prior to using the completed metal form—saving time and effort.
In practice, both 304 and 304L can be used for many of the same applications. The differences are often minor enough that one isn’t considered massively more useful over the other. When stronger corrosion resistance is needed, other alloys, such as grade 316 stainless steel, are usually considered as an alternative.
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