Welded hollow section for machine frames

Stainless Steel Square Tube

Welded square hollow sections are commonly reviewed for machine frames, structural supports and guarding. Quotation checks should cover the applicable standard, grade, dimensions, weld condition, finish and tolerance requirements.

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Stacked square stainless steel hollow sections without external branding

Tube

Cargo group

201 / 304 / 304L

Reference grades

ASTM

Primary standard

Standards

ASTMA554 (ornamental/structural)
JISG3446 (structural)
EN10296-2 (on request)

Dimensions

Section: 10×10 - 100×100 mm
Wall thickness: 0.5 - 3.0 mm
Length: up to 6 m, cut to size

Finishes and applications

Mill2BSatin (HL)Mirror (No.8)

Machine frames & structural supports
Equipment guarding & handrails
Conveyor and dip-line framework

Grades and properties

These values are references for quotation review. Actual heat values should be checked against the applicable mill test certificate.

201 / SUS201

ASTM 201 (S20100) / JIS SUS201 / EN 1.4372

Austenitic

Composition, wt %

C≤ 0.15

Cr16.0-18.0

Ni3.5-5.5

Mn5.5-7.5

Si≤ 1.00

P≤ 0.060

S≤ 0.030

N≤ 0.25

Minimum mechanical properties

Tensile strength: ≥ 515 MPa (75 ksi)
Yield strength (0.2%): ≥ 260 MPa (38 ksi)
Elongation: ≥ 40%
Hardness: ≤ 217 HB / 95 HRB

Annealed minimums based on ASTM A240 plate and sheet requirements. Tube standards such as A554 may differ; confirm the governing product standard and applicable mill test certificate.

304 / SUS304

ASTM 304 (S30400) / JIS SUS304 / EN 1.4301

Austenitic

Composition, wt %

C≤ 0.08

Cr18.0-20.0

Ni8.0-10.5

Mn≤ 2.0

Si≤ 0.75

P≤ 0.045

S≤ 0.030

N≤ 0.10

Minimum mechanical properties

Tensile strength: ≥ 515 MPa (75 ksi)
Yield strength (0.2%): ≥ 205 MPa (30 ksi)
Elongation: ≥ 40%
Hardness: ≤ 201 HB / 92 HRB

Annealed minimums based on ASTM A240 plate and sheet requirements. Tube standards such as A554 may differ; confirm the governing product standard and applicable mill test certificate.

304L / SUS304L

ASTM 304L (S30403) / JIS SUS304L / EN 1.4307

Austenitic

Composition, wt %

C≤ 0.030

Cr18.0-20.0

Ni8.0-12.0

Mn≤ 2.0

Si≤ 0.75

P≤ 0.045

S≤ 0.030

N≤ 0.10

Minimum mechanical properties

Tensile strength: ≥ 485 MPa (70 ksi)
Yield strength (0.2%): ≥ 170 MPa (25 ksi)
Elongation: ≥ 40%
Hardness: ≤ 201 HB / 92 HRB

Annealed minimums based on ASTM A240 plate and sheet requirements. Tube standards such as A554 may differ; confirm the governing product standard and applicable mill test certificate.

316L / SUS316L

ASTM 316L (S31603) / JIS SUS316L / EN 1.4404

Austenitic

Composition, wt %

C≤ 0.030

Cr16.0-18.0

Ni10.0-14.0

Mo2.0-3.0

Mn≤ 2.0

Si≤ 0.75

P≤ 0.045

S≤ 0.030

Minimum mechanical properties

Tensile strength: ≥ 485 MPa (70 ksi)
Yield strength (0.2%): ≥ 170 MPa (25 ksi)
Elongation: ≥ 40%
Hardness: ≤ 217 HB / 95 HRB

Annealed minimums based on ASTM A240 plate and sheet requirements. Tube standards such as A554 may differ; confirm the governing product standard and applicable mill test certificate.

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