ASTM A500 Seamless Structural Tube

ASTM A500 Seamless Structural Tube

ASTM A500 specification covers cold-formed welded and seamless carbon steel tubing in round, square, rectangular, and “special” shapes for welded, riveted, or bolted construction applications, as well as for general structural purposes...

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ASTM A500 Seamless Structural Tube

ASTM A500 specification covers cold-formed welded and seamless carbon steel tubing in round, square, rectangular, and “special” shapes for welded, riveted, or bolted construction applications, as well as for general structural purposes.

ASTM A500 spec states that welded tubing shall be made from flat-rolled steel using electric-resistance welding. Longitudinal butt joints of welded tubing shall be welded across its thickness in such a manner as to assure the structural design strength of the tubing section. Welded structural steel tubing is normally furnished without the removal of inside flash. 

Specification

Standard

ASTM A500

Steel Grade

GR A, GR.B, GR C, GR.D;

Size Range

Outer Dimensions: 21.3mm – 609.6mm

Wall Thickness: 2.0mm – 59.54 mm

Length: max 16000mm

Certificate

The products are supplied with 3.1 specific test certificates, according to EN 10204. Certification according to 3.2 can be agreed at the time of ordering.

Surface Treatment

Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.

Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.

Packing

Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.

2012625241131.jpgChemical Requirements

Composition, %

Element

Grades A, B and D

Grace C


Heat
Analysis

Product
Analysis

Heat
Analysis

Product
Analysis

Carbon, max
 

0.26

0.30

0.23

0.27

Manganese, max
 

...

...

1.35

1.40

Phosphorus, max
 

0.035

0.045

0.035

0.045

Sulfur, max
 

0.035

0.045

0.035

0.045

Copper, when copper steel
is specified, min

0.20

0.18

0.20

0.18

Tensile Requirements

Round Structural Tubing


Grade A

Grade B

Grade C

Grade D

Tensile strength, mn, ps (MPa)
 

45 000
(310)

58 000 
(400)

62 00
(427)

58 000
(400)

Yield strength, mn, psi (MPa)
 

33 000
(228)

42 000
(290)

46 000
(317)

36 000
(250)

Elongation in 2 in. (50.8 mm), min, %A
 

25B

23C

21D

23C

 

Shaped Structural Tubing


Grade A

Grade B

Grade C

Grade D

Tensile strength, mn, ps (MPa)
 

45 000
(310)

58 000 
(400)

62 00
(427)

58 000
(400)

Yield strength, mn, psi (MPa)
 

39 000
(269)

46 000
(317)

50 000
(345)

36 000
(250)

Elongation in 2 in. (50.8 mm), min, %A
 

25B

23C

21D

23C

Permissible Dimensional Variations
OUTSIDE DIMENSIONS

Outside diameter measurements must be made at positions at least 2” (50.8mm) from either end of the tubing.For round structural tubing with nominal OD of 1.900” (48.26mm) and smaller, the outside diameter may not vary more than ±0.5%, rounded to the nearest 0.005” (0.13mm), of the specified size. For nominal ODs of 2” (50.8mm) and larger, outside diameter may not vary more than ±0.75%, rounded to the nearest 0.005”.

Square structural tubing and rectangular structural tubing must be measured across the flats and include an allowance for convexity or concavity. Specified dimensions shall not exceed the plus/minus allowances shown in the table below.

Outside Dimension Tolerances For Square and Rectangular Structural Tubing

Outside Large Flat Dimension, in. (mm)

Large Flat Dimension Tolerance, A plus and minus, in. (mm)

2½ (63.5) or under
 

0.020 (0.51)

Over 2½ to 3½ (63.5 to 88.9), incl
 

0.025 (0.64)

Over 3½ to 5½, inc
 

0.030 (0.76)

Over 5½ (139.7)

0.01 times large flat dimension
 

WALL THICKNESS

Minimum wall thickness at any point of measurement shall not be less than 90% of specified nominal wall thickness. Maximum wall thickness, excluding weld seams, shall not be more than 110% of specified nominal wall thickness. Wall thickness of square structural tubing and rectangular structural tubing must be measured at the center of the flat.

STRAIGHTNESS

Permissible variation in straightness for structural tubing is 1/8” times the total length in feet (or 10.4mm times the number of meters) divided by five.

SIDE SQUARENESS

For square structural tubing and rectangular structural tubing, adjacent sides may deviate from 90° by no more than ±2°.

CORNER RADII

For square structural tubing and rectangular structural tubing, the radius of any one outside corner may not exceed three times (3x) the specified wall thickness.

TWIST

For square structural tubing and rectangular structural tubing, the tolerances for twist (variation with respect to axial alignment) are shown in the table below.

Edit by Mr. Will Fan of KRM/BSW
Contact us directly by:  
Email: will@kingruimansteelpipe.com  
Tel / Whatsapp: 0086-18511695725
Skype: willsteelpipe1



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