High strength low alloy (HSLA) steels for cold forming

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Text of High strength low alloy (HSLA) steels for cold forming

  • Automotive Worldwide

    High strength low alloy (HSLA) steels for cold forming

    Extract from the product catalogue -European edition

    Note: Information contained in this catalogue is subject to change.Please contact our sales team whenever you place an order to ensure that your requirements are fully met.

    Please contact us if you have a specific requirement that is not included in the range of products and services covered by this catalogue.We are also reachable by the e-mail address automotive.request@arcelormittal.com.

    http://fce.arcelormittal.com/saturnus/tmp/../sheets/images/large/traverse%20arriere%20en%20HSLA%20300.jpghttp://fce.arcelormittal.com/saturnus/tmp/../sheets/images/large/armature%20avant%20en%20DP%20780.jpghttp://fce.arcelormittal.com/saturnus/tmp/../sheets/images/large/HSLA%20340.jpghttp://fce.arcelormittal.com/saturnus/tmp/../sheets/images/large/HSLA-mise%20en%20forme%20_%20UK.jpghttp://fce.arcelormittal.com/saturnus/tmp/../sheets/images/large/EN%20_%20Courbe%20Wohler%20aciers%20HSLA%20_%20REV%202010.jpg

  • We are also reachable by the e-mail address automotive.request@arcelormittal.com.

    High strength low alloy (HSLA) steels for cold forming High yield and tensile strengthsteels

    Description

    Steels in the HSLA (High Strength Low Alloy) range are hardened by a combination of precipitation and grain size refining, resulting in high strength with low alloy content. This enhances weldability and choice of coatings, since these steels exhibit neither weld zone softening nor grain coarsening. These grades are particularly suitable for structural components such as suspension systems and chassis and reinforcement parts.For their respective yield strength levels, these steels all exhibit excellent cold forming and low-temperature brittle fracture strength (starting at grade 320).The entire range of HSLA steels offers good fatigue strength (suspension arm, shock tower) and impact strength (longitudinal beams, cross members, reinforcements, etc.).Because of their mechanical strength, the weight of reinforcement and structural components can be reduced.The HSLA range of products is available in hot and cold rolled grades. The various grades are identified by their yield strength.Hot rolled HSLA grades can be given a Class 1 hot-dip galvanized coating according to the EN 36503 standard (post-galvanizing).

    Applications

    The steels in the HSLA range are suitable for structural parts such as suspension systems, reinforcements, cross members, longitudinal beams, chassis components, etc. The mechanical properties of hot rolled HSLA steels and their excellent cold forming performance and low-temperature brittle fracture resistance support cost-effective solutions for many parts and sub-assemblies for which weight, thickness and size reduction are sought, such as:

    chassis components;wheels;slide rails;cross members.

    Rear cross member in Extragal-coated HSLA 300

    Front reinforcement in Dual Phase 780Shock absorber in HSLA 300

    Designation and standard

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  • Designation and standard

    Euronorms VDA 239-100

    HSLA 260HC260LA (+ZE) /HX260LAD (+Z,

    +ZF, +ZA) CR240LA (-UNC,-EG,-GI,-GA)

    HSLA 300HC300LA (+ZE) /HX300LAD (+Z,

    +ZF, +ZA) CR270LA (-UNC,-EG,-GI,-GA)

    HSLA 340HC340LA (+ZE) /HX340LAD (+Z,

    +ZF, +ZA) CR300LA (-UNC,-EG,-GI,-GA)

    HSLA 380HC380LA (+ZE) /HX380LAD (+Z,

    +ZF, +ZA) CR340LA (-UNC,-EG,-GI,-GA)

    HSLA 420HC420LA (+ZE) /HX420LAD (+Z,

    +ZF, +ZA) CR420LA (-UNC,-EG,-GI,-GA)

    Euronorms Uncoated ( EN 10268: 2006+A1: 2013): Steel grade nameElectrogalvanized (EN 10268 :2006+A1: 2013 + EN 10152 :2017): Steel grade name +ZEGalvannealed (EN 10346 :2015): Steel grade name +ZFExtragal (EN 10346 :2015): Steel grade name +ZGalfan (EN 10346 :2015): Steel grade name +ZA

    VDA 239-100 Uncoated: Steel grade name-UNCElectrogalvanized: Steel grade name-EGGalvannealed: Steel grade name-GAExtragal: Steel grade name-GI

    Hot rolled Cold rolled

    While the ArcelorMittal grades conform perfectly well to the indicated EN standards, ArcelorMittal grades generally offer tighter mechanical properties (see table below).

    Euronorms VDA 239-100

    HSLA 320 S315MC/HX340LAD (+Z) HR300LA (-UNC,-GI) HSLA 360 S355MC/HX380LAD (+Z) HR340LA (UNC,-GI) HSLA 420 S420MC/HX420LAD (+Z) HR420LA (-UNC,-GI) HSLA 460 S460MC/HX460LAD (+Z) HR460LA (-UNC,-GI) HSLA 500 S500MC/HX500LAD (+Z) HR500LA (-UNC,-GI) HSLA 550 S550MC HR550LA (-UNC,-GI)

    Euronorms Uncoated (EN 10149-2 :1995): Steel grade name

    VDA 239-100 Uncoated: Steel grade name-UNCExtragal: Steel grade name-GI

    Hot rolled Cold rolled

    While the ArcelorMittal grades conform perfectly well to the indicated EN standards, ArcelorMittal grades generally offer tighter mechanical properties(see table below).The above indicative tables summarize the European and VDA standards corresponding to the ArcelorMittal product range.

    Technical characteristics

    Mechanical propertiesGuaranteed for uncoated sheet in the transverse direction.

    YS (MPa) UTS (MPa)ef (%)

    L0 = 80 mmth < 3 mm

    HSLA 260 260 -320 350 -410 28HSLA 300 300 -360 390 -450 26HSLA 340 340 -400 420 -490 23HSLA 380 380 -450 460 -530 20HSLA 420 420 -520 470 -590 17

    Hot rolled Cold rolled

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  • Guaranteed for uncoated sheet in the rolling direction.

    YS (MPa) UTS (MPa)ef (%)

    L0 = 80 mmth < 3 mm

    Ef (%)L0 = 5,65 S0 (mm)

    th 3 mm

    HSLA 320 325 -385 415 -470 24 28HSLA 360 360 -435 450 -520 21 25HSLA 420 420 -500 490 -570 20 23HSLA 460 460 -550 550 -650 17 21HSLA 500 500 -590 570 -670 15 19HSLA 550 550 -650 650 -730 15 18

    Hot rolled Cold rolled

    Because HSLA steels can exhibit an extended elastic-plastic transition zone with variations in YS values, by convention only the lower yield strength (LYS) is taken into account in this zone.

    Microstructure of a cold rolled HSLA 340 steel

    Chemical composition (%)

    C Mn Si Max Max Max

    HSLA 260 0,080 0,50 0,04 HSLA 300 0,080 0,60 0,04 HSLA 340 0,080 0,70 0,04 HSLA 380 0,080 0,90 0,35 HSLA 420 0,140 1,60 0,40 HSLA 320 0,080 0,50 0,03 HSLA 360 0,080 0,60 0,03 HSLA 420 0,080 0,75 0,03 HSLA 460 0,120 1,60 0,40 HSLA 500 0,090 1,50 0,03 HSLA 550 0,090 1,65 0,35

    Hot rolled Cold rolled

    Available coatings and Worldwide availability

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  • Available coatings and Worldwide availability

    Uncoated Electrogalvanized Extragal Galvannealed

    EUR NAM SAM RSA CHI EUR NAM SAM RSA CHI EUR NAM SAM RSA CHI EUR NAM SAM RSA CHI

    HSLA 260

    HSLA 300

    HSLA 340

    HSLA 380

    HSLA 420

    HSLA 320

    HSLA 360

    HSLA 420

    HSLA 460

    HSLA 500

    HSLA 550

    Hot rolled Cold rolled

    Available in non-visible part quality Undergoing customer testing Under development Available in visible and non-visible part quality (Z)

    EUR : Europe Region -NAM : North America Region -SAM : South America Region -RSA : South Africa Region -CHI : China

    X Available

    Please consult us about the availability of additional HSLA products.

    Recommendations for use and secondary processing

    FormingDrawability declines progressively with increasing yield strength. Forming limit curves can be used to define maximum strains without necking for different deformation paths.

    Example of forming limit curves calculated for cold rolled HSLA sheet (thickness: 1.0 mm)

    We can provide additional forming data for steels in the HSLA range with particular thicknesses and coatings.

    Welding

    Weldability is determined according to the ISO 18278-2 method.

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