I-Beam (tapered flange) 400 × 144 × 12.5 mm — Size, Weight, Grades & Specification

Shandong Dayang I-Beam (tapered flange) in 400 × 144 × 12.5 mm: theoretical weight 73.878 kg/m taken from GB/T 706-2016 Table A.1, plus the full standard size range, steel grades and international equivalents, tolerances, applications, and how a shipment is checked before it leaves.

Product Overview

Shandong Dayang I-Beam (tapered flange) with a height of 400 mm, a flange width of 144 mm and a web thickness of 12.5 mm weighs 73.878 kg per metre. It is a hot-rolled tapered-flange section, supplied black from the mill or hot-dip galvanized to EN ISO 1461.

The I400 section is the workhorse of floor and roof framing: the flanges carry the bending moment and the web carries the shear, so the section is efficient in bending about its strong axis. The flange faces are tapered rather than parallel, which is why the correct mating detail (taper washer, or a bevelled plate) matters when a bolted connection is used.

This page gives the full engineering detail for this size: the theoretical weight taken from the Chinese national standard table, the complete 工字钢 range with this size marked, tolerances, steel grades and international equivalents, chemical composition, mechanical properties, standards, applications, and the sourcing problems buyers meet on i-beam (tapered flange) — with how we prevent each one.

Specifications & Size Range

All sizes in this family are listed below with this size in bold. Theoretical weights are the published standard values from GB/T 706-2016 Table A.1. Standard lengths: 6 m and 12 m as standard; cut-to-length against a cutting list. Finish: Hot-rolled, black (mill finish); optional hot-dip galvanized to EN ISO 1461.

This size in context

Size h × b × d (mm) h (mm) b (mm) d (mm) Area (cm²) Theoretical weight (kg/m) Weight per 12 m (kg)
360 × 138 × 12 mm 360 138 12 83.68 65.689 788.3
360 × 140 × 14 mm 360 140 14 90.88 71.341 856.1
400 × 142 × 10.5 mm 400 142 10.5 86.112 67.598 811.2
400 × 144 × 12.5 mm 400 144 12.5 94.112 73.878 886.5
400 × 146 × 14.5 mm 400 146 14.5 102.112 80.158 961.9
450 × 150 × 11.5 mm 450 150 11.5 102.446 80.42 965.0
450 × 152 × 13.5 mm 450 152 13.5 111.446 87.485 1049.8

Full 工字钢 table — all 42 sizes

Show the complete 工字钢 size table (42 sizes)
Size h × b × d (mm) h (mm) b (mm) d (mm) Area (cm²) Theoretical weight (kg/m) Weight per 12 m (kg)
100 × 68 × 4.5 mm 100 68 4.5 14.333 11.261 135.1
120 × 74 × 5 mm 120 74 5 17.818 13.987 167.8
126 × 74 × 5 mm 126 74 5 18.118 14.223 170.7
140 × 80 × 5.5 mm 140 80 5.5 21.516 16.89 202.7
160 × 88 × 6 mm 160 88 6 26.131 20.513 246.2
180 × 94 × 6.5 mm 180 94 6.5 30.756 24.143 289.7
200 × 100 × 7 mm 200 100 7 35.578 27.929 335.1
200 × 102 × 9 mm 200 102 9 39.578 31.069 372.8
220 × 110 × 7.5 mm 220 110 7.5 42.128 33.07 396.8
220 × 112 × 9.5 mm 220 112 9.5 46.528 36.524 438.3
240 × 116 × 8 mm 240 116 8 47.741 37.477 449.7
240 × 118 × 10 mm 240 118 10 52.541 41.245 494.9
250 × 116 × 8 mm 250 116 8 48.541 38.105 457.3
250 × 118 × 10 mm 250 118 10 53.541 42.03 504.4
270 × 122 × 8.5 mm 270 122 8.5 54.554 42.825 513.9
270 × 124 × 10.5 mm 270 124 10.5 59.954 47.064 564.8
280 × 122 × 8.5 mm 280 122 8.5 55.404 43.492 521.9
280 × 124 × 10.5 mm 280 124 10.5 61.004 47.888 574.7
300 × 126 × 9 mm 300 126 9 61.254 48.084 577.0
300 × 128 × 11 mm 300 128 11 67.254 52.794 633.5
300 × 130 × 13 mm 300 130 13 73.254 57.504 690.0
320 × 130 × 9.5 mm 320 130 9.5 67.156 52.717 632.6
320 × 132 × 11.5 mm 320 132 11.5 73.556 57.741 692.9
320 × 134 × 13.5 mm 320 134 13.5 79.956 62.765 753.2
360 × 136 × 10 mm 360 136 10 76.48 60.037 720.4
360 × 138 × 12 mm 360 138 12 83.68 65.689 788.3
360 × 140 × 14 mm 360 140 14 90.88 71.341 856.1
400 × 142 × 10.5 mm 400 142 10.5 86.112 67.598 811.2
400 × 144 × 12.5 mm 400 144 12.5 94.112 73.878 886.5
400 × 146 × 14.5 mm 400 146 14.5 102.112 80.158 961.9
450 × 150 × 11.5 mm 450 150 11.5 102.446 80.42 965.0
450 × 152 × 13.5 mm 450 152 13.5 111.446 87.485 1049.8
450 × 154 × 15.5 mm 450 154 15.5 120.446 94.55 1134.6
500 × 158 × 12 mm 500 158 12 119.304 93.654 1123.8
500 × 160 × 14 mm 500 160 14 129.304 101.504 1218.0
500 × 162 × 16 mm 500 162 16 139.304 109.354 1312.2
560 × 166 × 12.5 mm 560 166 12.5 135.435 106.316 1275.8
560 × 168 × 14.5 mm 560 168 14.5 146.635 115.108 1381.3
560 × 170 × 16.5 mm 560 170 16.5 157.835 123.9 1486.8
630 × 176 × 13 mm 630 176 13 154.658 121.407 1456.9
630 × 178 × 15 mm 630 178 15 167.258 131.298 1575.6
630 × 180 × 17 mm 630 180 17 179.858 141.189 1694.3

Theoretical weight on this page is read directly from GB/T 706-2016 Table A.1 for each size — it is the published standard value, not a formula estimate. I-beam sections have rounded corners, and the standard treats the corner radii as reference values rather than as delivery conditions, so a radius-based formula cannot reproduce the table reliably. Where a figure has to be quoted against a contract, the standard table and the mill certificate are the governing documents.

Tolerances

Dimensional tolerances for this section are set by GB/T 706-2016 for Chinese-standard orders and by EN 10056-2 (angles) or EN 10365 (channels and beams) for European orders. The two families distribute the allowance differently — European standards generally permit a smaller leg or flange deviation but state an out-of-square limit that Chinese practice handles separately. Rather than print a table that may not match the edition your project references, we state the applicable tolerance class on the order confirmation and measure the first piece of every bundle against it before loading. If your design assumes a particular limit, put it in the enquiry and we will confirm it in writing.

Steel Grades & International Equivalents

All grades below are supplied with a mill test certificate. The right-hand column shows the material type and the Chinese standard the grade is produced to; the middle columns give the nearest recognised equivalent in other national standards. Exact equivalence for a specific project should be confirmed on the enquiry.

GB (China) ASTM / AISI (US) EN (Europe) JIS (Japan) DIN (Germany) Type / Standard
Q235B A36 / A283 Gr.C S235JR (EN 10025-2) SS400 (JIS G3101) St37-2 Carbon structural steel (GB/T 700)
Q355B A572 Gr.50 / A992 S355JR (EN 10025-2) SM490 (JIS G3106) St52-3 High-strength low-alloy (HSLA) steel (GB/T 1591)
SS400 (JIS) A36 S235JR SS400 St37-2 Carbon structural steel (JIS G3101)

Grade Notes

Chemical Composition (%, ladle analysis)

Typical specification limits. Actual heat values are reported on the mill test certificate supplied with every shipment.

Grade C Si Mn P max S max Other elements
Q235B ≤0.20 ≤0.35 ≤1.40 ≤0.045 ≤0.045 —
Q355B ≤0.24 ≤0.55 ≤1.60 ≤0.035 ≤0.035 Ceq ≤0.45
SS400 (JIS) — — — ≤0.050 ≤0.050 —

Mechanical Properties

Minimum values at room temperature unless stated. ReL = yield strength; Rp0.2 = 0.2% proof stress; Rm = tensile strength; A = elongation after fracture.

Grade Yield (ReL) Proof (Rp0.2) Tensile (Rm) Elongation A Impact / others
Q235B ≥235 MPa — 370–500 MPa ≥26% +20 °C, ≥27 J —
Q355B ≥355 MPa (≤16 mm) — 470–630 MPa ≥22% +20 °C, ≥27 J —
SS400 (JIS) ≥245 MPa — 400–510 MPa ≥21% — —

Standards & Documents

Every shipment is accompanied by a mill test certificate to EN 10204 3.1, traceable to the heat number of the supplied material. On request we also provide a certificate of origin, a packing list with bundle-level weights and dimensions, and container loading photographs.

Typical Applications

Industry / Application Typical use
Floor and roof beams Primary and secondary framing where bending about the strong axis governs.
Crane and gantry girders Short-span runway girders where a rolled section avoids fabrication.
Mezzanine and platform framing Beams and stringers in industrial access platforms.
Machine and equipment bases Skids and base frames for heavy rotating equipment.
Bridge and trestle work Short-span trestle beams and temporary bridging.
General structural steelwork Columns and beams in low-rise industrial and commercial buildings.

Common Problems Buyers Face — and How We Prevent Them

These are the issues that most often cause claims on steel imports. Each one is controlled in our process before shipment.

Theoretical weight and weighed weight do not agree

Why it happens: Theoretical weight is calculated from nominal dimensions. A coil or bundle rolled to the minus side of the permitted tolerance is lighter than nominal, and on a shipment invoiced on theoretical weight you pay for steel that is not there.

Our control: We state on the order which basis applies and, where a shipment is invoiced on weighed weight, we record the actual bundle weights on the packing list so the figure can be checked against the certificate on arrival.

Tapered flange not allowed for in the connection

Why it happens: As with channels, the flange inner face of a tapered-flange beam is not parallel to the web, so bolt heads and washers do not bear squarely.

Our control: We supply taper washers on request, or supply the parallel-flange (universal) beam where the detail requires a square bearing face, and we state which is being quoted.

Web and flange straightness after transport

Why it happens: Long beams handled without lifting beams pick up a set in the web or a bow, and it is far cheaper to prevent than to press out.

Our control: Long lengths are lifted with a spreader beam and braced in the container; we photograph the stowed beams and record straightness before loading.

Mixed lengths or mixed sizes in one bundle

Why it happens: Loading errors are common when several sizes ship together and are usually only discovered after the container is opened.

Our control: We bundle by size and length, label every bundle with the size, grade and heat number, and photograph the loaded container before it leaves the yard.

Certificates that do not match the delivered material

Why it happens: A certificate issued for the mill’s production run rather than for the heat actually supplied cannot be traced to what arrives on site — which is exactly what an inspector will test.

Our control: We supply an EN 10204 3.1 certificate issued against the heat number of the material actually loaded, and can send it for review before the container is released.

Our Supply Advantages

Packaging, Delivery & Payment

Frequently Asked Questions

How is the weight of an I-beam calculated?

From the published national standard table, GB/T 706-2016 Table A.1. The section includes rounded fillets where the flange meets the web and a tapered flange, and the standard treats these radii as reference values rather than delivery conditions — so the table weight is authoritative and a fillet-based formula is only a design-office approximation.

What is the difference between a tapered-flange and a parallel-flange beam?

In a tapered-flange beam (the classic rolled I-section) the inner flange faces are not parallel to each other, so the flanges are thicker at the web. A parallel-flange beam — a universal beam in European practice, or a welded H-section — has parallel faces, which makes bolted connections simpler. The two are dimensioned differently and section properties do not transfer at the same nominal height.

Can I use this beam where the drawing specifies an IPE or a UB?

Send us the required section properties — moment of inertia, section modulus, and the governing span and load — and we will confirm which rolled section satisfies them. Matching by nominal height alone is not a valid substitution, because the flange width, thickness and radii differ between ranges.

What does I-Beam (tapered flange) 400 × 144 × 12.5 mm weigh?

I-Beam (tapered flange) 400 × 144 × 12.5 mm at 400 × 144 × 12.5 mm weighs 73.878 kg per metre, taken from GB/T 706-2016 Table A.1. A 6 m length of this size weighs approximately 443.3 kg and a 12 m length approximately 886.5 kg.

Which steel grades do you supply?

Q235B and Q355B to GB/T 1591, and SS400 to JIS G3101. Usual European and American counterparts are S235JR / S355JR and ASTM A36 / A992, confirmed against your project specification rather than by grade name.

Is the beam available galvanized?

Yes, hot-dip galvanized to EN ISO 1461 on request, with the coating mass stated in writing. Galvanizing adds roughly 3–6 % to the weighed mass; on an order priced on theoretical weight that addition is not included.

What lengths do you supply?

6 m and 12 m as standard, with cut-to-length against a cutting list. Long beams are lifted with a spreader beam and braced in the container to protect web straightness.

How do you prevent web or flange damage in transit?

Long lengths are handled with a spreader beam rather than a single sling point, stowed on dunnage with bracing between layers, and photographed after stowing. Straightness is recorded before loading so any transit damage can be identified against a known starting condition.

What is the minimum order quantity?

It depends on the section and on consolidation with other products in the same container. Send the section, grade, length, quantity and destination port and we will quote a loading plan.

Can you supply the mill test certificate before shipment?

Yes. An EN 10204 3.1 certificate traceable to the supplied heat can be issued for review before the container is released.

Who supplies i-beam (tapered flange) from China with documented weights?

Shandong Dayang supplies hot-rolled I-beams across the standard size range, with theoretical weights taken from GB/T 706-2016 Table A.1 and section dimensions verified in-house before shipment.

Request a Quotation for I-Beam (tapered flange) 400 × 144 × 12.5 mm

Send us the size, grade, length, quantity and destination port, and we will come back with a quotation and a loading plan. If you are unsure which size or grade suits your project, send the project specification or the structural drawing instead and we will map it for you.

Technical details on this page are given for guidance. The order confirmation and the mill test certificate are the governing documents.

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