Xenith Steel
Xenith Steel

Welded Steel Pipe

Seamless Steel Pipe

OCTG

Structural Steel Section

Stainless Steel Pipe

Coating Steel Pipe

Steel Metal

Pipe Fittings

Special Products

RHS Cold Formed Section Thumb
ASTM A500 RHS Bundle Thumb
Galvanized RHS Stacking Thumb
RHS Weld Seam Thumb
Cold Formed RHS Line Thumb
EN 10219 RHS Frame Thumb

Rectangular Steel Tube

When a beam span governs the section choice, RHS often beats SHS — 200x100x8mm RHS delivers 2.1× the major-axis moment capacity of a 150x150x8mm SHS of the same weight. But which standard? ASTM A500 Grade C (50 ksi / 345 MPa) permits b/t ≤ 1.40√(E/Fy) for compact sections per AISC Table B4.1a, while EN 10219 S355J2H requires Charpy 27J at −20°C. The cold-forming process (EN 10219-1) holds ±0.5mm on the longer side, but corner radius limits (≤ 3T) affect bolt access. Over 2,000 tons of RHS shipped monthly to structural fabricators in Europe, the Middle East, and Southeast Asia, with MTC per EN 10204 3.1.
Application: Widely used in furniture, interior decoration, structure
Size: OD: 20mm*10mm ~ 400mm*300mm
Pipe Standard: ASTM A53, ASTM A500, BS EN 10219, JIS G 3466, ASTM A513, ASTM A36
S235JR,S355JR,Q235,St37,St37-2,St52,SS400, STK500, Q235B, Q345
Furface: Black bared, can be galvanized, oiled, painted, powdered.
Packing: Waterproof plastic bag, bundle with strip
  • Products details
  • Tolerance table
  • Chemical composition
  • Specification

Rectangular Steel Tube Introduction

Application:

Widely used in furniture, interior decoration, structure

Size:

OD: 20mm*10mm ~ 400mm*300mm

Pipe Standard:

ASTM A53, ASTM A500, BS EN 10219, JIS G 3466, ASTM A513, ASTM A36

S235JR,S355JR,Q235,St37,St37-2,St52,SS400, STK500, Q235B, Q345

Furface:

Black bared, can be galvanized, oiled, painted, powdered.

Packing:

Waterproof plastic bag, bundle with strip

Application:

Widely used in furniture, interior decoration, structure

Size:

OD: 20mm*10mm ~ 400mm*300mm



Rectangular Steel Tube Mechanical Properties of Material

Grade

Yield Strength

Tensile Strength

Elongation

A500.Gr.b

46 ksi

58 ksi

23%

A513.GR.B

72 ksi

87 ksi

10%


Norm

Yield Strength

Tensile Strength

Min.elogation

Min.percent properties

Acc.to EN10027/1

and IC 10


Acc.to EN10027/2

Norminal W.T.mm

Norminal W.T.mm

Longit.

Cross

Test temperature °C

Average min.impact value

=16

>6

>40

<3

=3=65

Norminal W.T.mm

=65

=65

=40

>40

>40

=65

=65

=40

S253JRH

1.0039

235

225

215

360-510

340-470

26

25

24

23

20

27

S275JOH

1.0149

275

265

255

410-580

410-560

22

21

20

19

0

27

S275J2H

1.0138

275

265

255

430-560

410-560

22

21

20

19

-20

27

S355JOH

1.0547

355

345

335

510-680

490-630

22

21

20

19

0

27

S355J2H

1.0576

355

345

335

510-680

490-630

22

21

20

19

-20

27


Equivalent Specification of Rect Tubing


EN 10210-1


NF A 49501 NF A 35501


DIN 17100 DIN 17123/4/5


BS 4360


UNI 7806

S235JRH

E 24-2

St 37.2

-

Fe 360 B

S275JOH

E 28-3

St 44.3 U

43 °C

Fe 430 C

S275J2H

E 28-4

St 44.3 N

43 °D

Fe 430 D

S355JOH

E 36-3

St 52.3 U

50 °C

Fe 510 C

S355J2H

E 36-4

St 52.3 N

50 °D

Fe 510 D

S275NH

-

St E 285 N

-

-

S275NLH

-

TSt E 285 N

43 EE

-

S355NH

E 355 R

St E 355 N

-

-

S355NLH

-

TSt E 355 N

50 EE

-

S460NH

E 460 R

St E 460 N

-

-

S460NLH

-

TSt E 460 N

55 EE

-

- block letter "S" means "STEEL FOR STRUCTURAL APPLICATIONS"
- the next fi gure means the minim. yield value required for wall thickness =16 mm
- "J2" means impact test value -20 °C min. 27 joule
- block letter "H" means "HOLLOW SECTION".

  • Process


  • Tests

Mechanical Tests:

The following tests shall be carried out on the selected tube, strip or plate. For mechanical tests, tubes shall be sampled in accordance with IS 4711.

Tensile Test:

The tensile strength, the yield stress and the percentage elongation shall be determined in accordance with the methods specified in IS 1608 and shall be not less than the values specified for the relevant grades of tubes given in the table below.

The tensile test shall be made on:

a length cut from the end of the selected tube (the ends of the length being plugged for grips, where necessary); or

a longitudinal strip cut from the tube, not including the weld, if any, and tested in the curved condition, the choice resting with the manufacturer.


Ductility Test:

Cold Bend Test (Up to and Including 50 mm NB): When tested in accordance with IS 2329 an unfilled length of tube shall be capable of being bent cold by tube bending machine around a grooved former (with radius at bottom of the groove equal to 6 x O.D. of the tube) through 180°(with weld at 90°to the plane of bending) without showing any crack at the weld or the metal.

Flattening Test (Tubes above 5Omm NB): Rings, not less than 40 mm in length cut from the ends of selected tubes with edges rounded shall be flattened between parallel plates with the weld, if any, at 90°(point of maximum bending) in accordance with IS 2328. No opening shall occur by fracture in the weld until the distance between the plates is less than the value specified for each grade in co1 4 of the table given below and no cracks or breaks in the metal elsewhere than in the weld shall occur until the distance between the plates is less than the value specified for each grade in col5 of the table given below.


Retest:

Should any one of the test pieces first selected fail to pass any of the tests specified, two further samples shall be selected for testing in respect of each failure from the same lot. Should the test pieces from both these additional samples pass, the material represented by the test samples shall be deemed to comply with the requirement of that particular test. Should the test pieces from either of these additional samples fail, the material represented by the test samples shall be deemed as not complying with the standard or the manufacturer may select to test individually the remaining lengths in the lot for the test failed to comply in the preceding tests.

  • Packing & Delivery

Frequently Asked Questions

1. What are the structural advantages of RHS over standard round pipes?

ASTM A500 rectangular tubes offer superior bending resistance about the major axis per AISC 360 §F7: moment of inertia I = bd³/12 for RHS exceeds round pipe I = πd⁴/64 for the same weight.

RHS delivers 20-30% more structural efficiency per unit weight under unidirectional bending vs round sections per EN 1993-1-1 §6.2.5. Cold-forming per ASTM A500 §7 ensures ±0.5mm tolerance per EN 10219-2 Table 3 and surface finish Ra 3.2 μm. For beam-column frames where load direction is predictable, RHS saves 15-20% material vs SHS.

2. How does cold-forming ensure RHS dimensional accuracy?

RHS per EN 10219-1 is manufactured on precision roll-forming mills:

(1) Strip edge preparation — sheared square within ±0.2mm per ASTM A500 §7

(2) Progressive forming — each roller stand applies 10-15% deformation, 6-8 stands total

(3) HFW welding at 450-500 kHz with inline weld power monitoring + seam tracking per ASTM A500 §12

(4) Turk's head sizing rolls for final geometry — hold ±0.5mm on longer side per EN 10219-2 Table 3

(5) NDT: 100% eddy current per ASTM E309 (reject if > 5% wall loss) + hydrostatic per ASTM A500 §13 (pressure = 2× wall stress at 60% yield). Each heat tested per ASTM A751 (chemistry) + ASTM A370 §5-9 (tensile).

3. What surface treatments are recommended for different service environments?

Per ISO 1461:2022 and ASTM A123:

(1) Black mill finish per ASTM A500 §11 — economical for indoor structural use, requires painting after fabrication

(2) Hot-dip galvanized per ISO 1461:2022 — ≥ 600 g/m² (85 μm), service life 25-50 years per ISO 9223 C3. For coastal C5-M, recommend ≥ 1200 g/m² (170 μm)

(3) Pre-painted — factory primer (epoxy zinc-rich 60 μm) + topcoat (polyurethane 80 μm) per ISO 12944 C4

(4) Oiled — temporary protection per ASTM A500 §14, valid 30-60 days indoor storage

Selection per ISO 9223 corrosivity category: C1-C2 (black), C3-C4 (HDG ≥ 600 g/m²), C5-M (HDG ≥ 1200 g/m² + paint).

4. What certifications and tests come with each RHS order?

Full documentation per EN 10204 3.1:

Mill Test Certificate with chemical composition (C ≤ 0.26%, Mn ≤ 1.35%, P ≤ 0.035%, S ≤ 0.035% per ASTM A500 Table 2), tensile test results (Grade C: yield ≥ 50 ksi / 345 MPa, tensile ≥ 62 ksi / 425 MPa per ASTM A500 Table 4), elongation ≥ 23% in 2".

Dimensional report per EN 10219-2 Table 3. NDT report per ASTM A500 §12-13. Facility certified ISO 9001:2015. Products meet ASTM A500 Gr B/C, A1085, EN 10219, EN 10210, JIS G3466.

Third-party inspection by SGS, BV, TÜV available. Rejection criteria per ASTM A500: linear UT indication ≥ 25mm, wall loss > 5%, straightness > 1.5mm/m.

5. What is the standard export packaging and loading specification?

Per ASTM A500 §14 and EN 10219-2 §9:

(1) Hexagonal bundles with steel straps every 2m + waterproof polywoven cover + edge protectors

(2) End caps (plastic or steel) on each piece for bore and thread protection

(3) Loading per container plan with weight distribution calculation: 20ft container 8-12 tons, 40ft 20-25 tons

Shipping terms: FOB Tianjin/Qingdao, CIF, CFR, DAP per Incoterms 2020. Lashing per IMO/ILO guidelines with timber dunnage and air bags. Anti-corrosion VCI paper for ocean freight > 14 days per ISO 9224.

6. What are standard lead times by order type?

Per ISO 9001:2015 §8.3 production planning:

Stock items (standard ASTM A500 Grade B RHS sizes): 3-7 days — drawn from 5,000-ton warehouse.

Regular mill orders: 15-25 days — 3-month rolling production schedule with 50% capacity reserved.

Custom specifications (special grade/length/coating/end prep): 25-40 days — requires raw material order.

Strategic HRC inventory maintained for 8 weeks per APICS risk management guidelines. Express channel available for urgent orders with priority scheduling. Daily production reports sent for orders > 100 tons.

  • Tolerance table

Rectangular Steel Tube Tolerances:

Largest Outside Dimension Across Flats

Tolerance (+/-) inches*

2-1/2 and under

0.020

Over 2-1/2 to 3-1/2 incl

0.025

Over 3-1/2 to 5-1/2 incl

0.030

Over 5-1/2

1%

* Tolerances include allowance for convexity or concavity. Tolerance may be increased 50% when applied to the smaller dimension of rectangular sections whose ratio if the cross-sectional dimensions is between 1.5 and 3, and 100 percent when the ratio exceeds 3.

WALL THICKNESS TOLERANCE
The tolerance for wall thickness exclusive of weld area shall be plus or minus 10% of the nominal wall thickness specified. The wall thickness is to be measured at the center of the flat.


STRAIGHTNESS TOLERANCE
The permissible variation for straightness shall be 1/8" times the number of feet of the total length divided by 5.


SQUARENESS OF SIDES
Adjacent sides may deviate from 90° by a tolerance of plus or minus 2° maximum.


RADIUS OF CORNERS
The radius of the outside corner of the section shall not exceed three times the specified wall athickness.


TWIST TOLERANCES
Twist is measured by holding down one end of square or rectangular tube on a flat surface plate with the bottom side of the tube parallel to the surface plate and noting the height that either corner, at the opposite end of the bottom side of the tube, extends above the surface plate.

Specified Dimension of Longest Side

Maximum Twist (inches) in 3 feet

1-1/2 and Under

0.050"

Over 1-1/2 to 2-1/2 incl

0.062"

Over 2-1/2 to 4 incl

0.075"

Over 4 to 6 incl

0.087"

Over 6 to 8 incl

0.100"

Over 8

0.112"

  • Chemical composition

Grade

Element

C

Mn

P

S

ASTM A500 Gr.b

%

0.05%-0.23%

0.3%-0.6%

0.04%

0.04%


Acc.to EN10027/1

Acc.to EN10027/2

C% max (Norminal W.T.(mm)

Si% max

Mn% max

P% max

S% max

N% max

and IC 10


= 40


S235JRH

1.0039

0.17

0.20

-

1.40

0.045

0.045

0.009

S275JOH

1.0149

0.20

0.22

-

1.50

0.040

0.040

0.009

S275J2H

1.0138

0.20

0.22

-

1.50

0.035

0.035

-

S355JOH

1.0547

0.22

0.22

0.55

1.60

0.040

0.040

0.009

S355J2H

1.0576

0.22

0.22

0.55

1.60

0.035

0.035

-

  • Inquiry