steel alloy

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Flat products, hot rolled into high strength steels for cold forming

High Strength,low alloy steels

1 Description and advantages

These steels conform to the European standard EN 10149.2 :

1995. This type of steel is called a high strength, low alloy (HSLA)steel.

High strength, low alloy steels are characterised by low carbon and

alloy element contents, which give them excellent functional proper-

ties such as suitability for cold forming, profiling, welding and coa-

ting. Their strengthening mechanisms of precipitation hardening and

grain size refinement enable the achievement of high strength levels.

Advantages of HSLA steels:

They combine improved weldability, due to the very low carbon le-

vel, with good formability. Their mechanical characteristics facilitate

forming on presses and automated lines. They are further characteri-

sed by a good resistance to fatigue and impact.

Thanks to their high elasticity limit (Re), they are particularly suited

when a reduction in weight is required. This is why these steels are

often used to replace conventional structural steels.

Weight and thickness reduction

S235JR S315MC S355MC S500MC S700MC

10.00mm 8.50mm 8.00mm 7.00mm 6.00mm8.00mm 6.80mm 6.40mm 5.60mm 4.80mm6.00mm 5.10mm 4.80mm 4.20mm 3.60mm4.00mm 3.40mm 3.20mm 2.80mm 2.40mm

Weight andthicknessreduction

15% 20% 30% 40%

(Approximate values calculated using the yield strength of unbent steel. Forunits working in bending conditions or in compression, it must be recalculatedconsidering static and dynamic factors).

2 Typical applications

HSLA steels are generally for structural parts such as welded tubes,

beams and profiled or slightly pressed parts.

HSLA steels are used in sectors such as :

Automotive: pressed chassis and reinforcement parts, beams or

welded tubes.

Seats: tubes, rails and mechanical elements.

Industrial vehicles, tractors, trailers and skips as chassis compo-

nents (resistance to fatigue).

Lifting and handling equipment (cranes, fork lifts, platforms, ware-

house shelves, lifts).

The agricultural sector for chassis and protective elements.

Roll bars, buildings, containers, urban lighting masts, concrete

mixers

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3 Standards and specifications

Conforms to the European standard EN 10149.2 : 1995. This Eu-

ropean standard stipulates the requirements for high strength, low

alloy steels.

3.1) Mechanical properties

GradesYield

Strength(MPa) min

TensileStrength(MPa)

min-max

ElongationL0=80mmT


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Grade S420MC12,70mm 960 1595

960 159510,00mm 960 1595960 1595

8,00mm 960 1595960 1595

6,00mm 960 1595960 1595

4,00mm 960 1595960 1595

3,40mm 960 15953,20mm 960 1570 15953,00mm 960 1500 1595

960 1420 1530960 1420 1530960 1420 1530

2,80mm 960 1420 15302,60mm 960 1360 14602,40mm 960 1280 13802,20mm 960 1210 13502,10mm 960 1180 12802,00mm 960 1140 12201,90mm 960 11801,80mm 960 11501,70mm 960 11101,60mm 960 10701,50mm 960 1060

Grades S460MC10,00mm 960 1100

960 11008,00mm 960 11006,50mm 960 15006,00mm 960 1595

960 15954,00mm 960 15953,80mm 960 15953,40mm 960 1520

3,30mm 960 15203,20mm 960 14003,00mm 960 14002,80mm 960 13002,60mm 960 13002,50mm 960 12502,40mm 960 12102,30mm 960 11902,20mm 960 11702,10mm 960 11402,00mm 960 1120

Grades S500MC10,00mm 960 11009,00mm 960 11008,00mm 960 15007,50mm 960 15007,00mm 960 15006,50mm 960 15006,00mm 960 15955,50mm 960 15955,00mm 960 15954,50mm 960 15954,19mm 960 1595

3,80mm 9603,60mm 960 15603,20mm 960 14303,00mm 960 13602,80mm 960 13002,50mm 960 12002,40mm 960 11602,30mm 960 11202,20mm 960 1080

2,10mm 960 10502,00mm 960 1020

Grades S550MC10,00mm 960 11009,00mm 960 11008,00mm 960 12507,50mm 960 13006,50mm 960 14506,00mm 960 15955,50mm 960 15955,00mm 960 15954,20mm 960 15404,00mm 960 14803,80mm 960 14803,40mm 960 13803,30mm 960 13503,20mm 960 13203,10mm 960 12603,00mm 960 1260

2,50mm 960 1120

Standard range

Extended range subject to mill approval

Grades S600 ET 700MC

10,00mm 960 11009,00mm 960 11008,00mm 960 11007,50mm 960 12006,50mm 960 15006,00mm 960 15005,50mm 960 15605,00mm 960 15604,60mm 960 13504,20mm 960 13503,80mm 960 13003,40mm 960 1200

3,00mm 960 1100

Production standardProduction sous rserve accord usine

5.2) Thickness tolerancesThe thickness tolerances of this product range of conform toEN 10051

3/4 EN 10051 on request1/2 EN 10051 on request

6 Coil weight, protection, packaging and documents

Coils with a mill finish:Maximum coil weight: 26 tonnes.Standard weight :14 to 18kg/mm of width.Max outside diameter: 2,050mm.Inside diameter: 762mm +/-30.Eye horizontal.

Pickled coils:Maximum coil weight: 25 tonnes.Standard weight :14 to 18kg/mm of width.Max outside diameter: 1900mm.Inside diameter: 610mm +/-30.Eye horizontal.

Protection and packaging:Radial and circumferential strapping.1 internal label / 1 external label.Bar coding according to the Galia/Odette standard.For pickled products: coated with protective anticorrosion

oil or oil for rerolling.

Documents : Certificates in accordance with EN10204:2004.

7 Information and particular suggestions

Weldability: These steels can be welded by all conventional wel-

ding processes due to their low carbon equivalent values.

Cutting:These steels can be finished by all mechanical cutting pro-

cesses as well as by laser or high definition plasma cutting. Low

speed fl ame cutting is not advised as it may cause a deterioration of

the mechanical properties.

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Nearest equivalent specifications (Guideline only):Corresponding specification Former corresponding specification

Grades Steel Number EU 149 part 2 SEW 092* GB BS1449 US SAEJ1392S315MC 1.0972 QStE300TM 43F35 Gr 45S355MC 1.0976 FeE355-TM QStE360TM 46F40 Gr 50S420MC 1.0980 FeE420-TM QStE420TM 50F45 Gr 60S460MC 1.0982 QStE460TM Gr 65S500MC 1.0984 QStE500TM Gr 70S550MC 1.0986 FeE560-TM QStE550TM 60F55 Gr 80S600MC 1.8969 QStE600TMS650MC 1.8976 QStE650TMS700MC 1.8974 QStE690TM 75F70 A515

*The strength values of these grades of steel are tested on transverse samples.

For further information, contact our Technical Department.

The information given in this data sheet are correct at the time of publishing and are intended to give a general guideline for the purchasing and use of the steels.

Values quoted must not be considered as being guaranteed unless specifically confirmed separately in writing.

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