Steel Strip grades used in the Automotive Industry

  
 
 
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Automotive Industry steel strip grades


 

Note that this is a representative list and would be only a small selection of all available steels and shows only a few of the properties.

1. Hot rolled steels:

British Standard Grade (BSEN 10111)

Description

Yield Strength
N mm-2

Max Tensile Strength
N mm-2

Min % Total Elongation 80mm GL

Composition, maximum values

DD11

Commercial quality

170-360

440

23

0.12C, 0.60Mn, 0.045S, 0.045P

DD12

Drawing quality

170-340

420

25

0.10C, 0.45Mn, 0.035S, 0.035P

DD13

Deep drawing quality

170-330

400

28

0.08C, 0.40Mn, 0.03S, 0.03P

DD14

Extra deep drawing quality

170-310

380

31

0.08C, 0.35Mn, 0.025S, 0.025P

2. Selected hot rolled high strength steels:

British Standard Grade (BSEN 10149)

Description

Yield Strength
N mm-2

Max Tensile Strength
N mm-2

Min % Total Elongation 80mm GL

Composition, maximum values

S315MC

Microalloyed formable high strength steel

315

390-510

20

0.12C, 1.30Mn, 0.02S, 0.025P + Nb, V and/or Ti

S355MC

Microalloyed formable high strength steel

355

430-550

19

0.12C, 1.50Mn, 0.02S, 0.025P + Nb, V and/or Ti

S460MC

Microalloyed formable high strength steel

460

520-670

14

0.12C, 1.60Mn, 0.015S, 0.025P + Nb, V and/or Ti

CMn300

Carbon manganese high strength steel

300

440 min

26

0.15C, 0.90Mn, 0.006S, 0.035P

CMn350

Carbon manganese high strength steel

350

540 min

20

0.15C, 1.50Mn, 0.006S, 0.035P

3. Selected cold rolled steels:

British Standard Grade (BSEN 10130)

Description

Yield Strength
N mm-2

Max Tensile Strength
N mm-2

Min % Total Elongation 80mm GL

Composition, maximum values

DC01 (FeP01)

Drawing quality

280

270-410

28

0.12C, 0.60Mn, 0.045S, 0.045P

DC04 (FeP04)

Extra deep drawing quality

210

270-350

38

0.08C, 0.40Mn, 0.03S, 0.03P

DC06 (FeP06)

Extra deep drawing quality (interstitial free grade) min r = 1.8 and n=0.22

180

270-350

38

0.02C, 0.25Mn,

0.02S, 0.02P, 0.30Ti

4. Selected cold rolled high strength steels:

Grade / description

Max Yield Strength
N mm-2

Min Tensile Strength
N mm-2

Min % Total Elongation 80mm GL

Microalloyed formable high strength steel

300

400

22

Microalloyed formable high strength steel

350

430

20

Rephosphorised high strength steel

225

340*

30*

Rephosphorised high strength steel

255

380*

28*

Bake hardenable steel

210

320*

30*

Bake hardenable steel

255

360*

28*

* nearest equivalent

These grades may also be available with an electrolytic zinc or zinc-nickel coating, up to 7.5Ám per side

5. Selected cold rolled electrolytically zinc-coated steels:

British Standard Grade (BSEN 10152)

Description

Yield Strength
N mm-2

Max Tensile Strength
N mm-2

Min % Total Elongation 80mm GL

Composition, maximum values

DC01+ZE

Drawing quality

280

270-410

28

0.12C, 0.60Mn, 0.045S, 0.045P

DC04+ZE

Extra deep drawing quality

220

270-350

37

0.08C, 0.40Mn, 0.03S, 0.03P

DC06+ZE

Extra deep drawing quality (interstitial free grade) min r = 1.8 and n=0.22

190

270-350

37

0.02C, 0.25Mn, 0.02S, 0.02P, 0.30Ti

Similar grades are also available with an electrolytic zinc-nickel coating

6. Selected hot-dip galvanised steels:

British Standard Grade (BSEN 10142)

Description

Max Yield Strength
N mm-2

Max Tensile Strength
N mm-2

Min % Total Elongation 80mm GL

DX51D (FeP02G)

Bending quality

-

500

22

DX52D (FeP03G)

Drawing quality

300

420

26

DX53D (FeP05G)

Deep drawing quality

260

380

30

DX54D (FeP06G)

Special deep drawing quality (interstitial free grade)

220

350

36

These grades are available with a normal coating spangle finish or with an iron-zinc alloy coating. Coating masses range from 100 g m-2 to 600 g m-2.

Various proprietary grades of high strength formable hot-dip galvanised steel are also available.

 

 

 

Steel Specifications

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Micro-Alloyed Steels

A micro-alloyed steel can be defined as a carbon-manganese steel containing deliberately added alloying elements totalling only 0.05 to 0.10%. Alloying elements which are effective in modifying steel properties when present in such small amounts include boron, vanadium and niobium and boron in even lesser amounts (0.005% /0.003%).

Micro-alloyed steels are manufactured in Large tonnages for high pressure pipelines in the petroleum industry and automotive forgings.

A major advantage of these steels is that in the case of forgings, careful control of forge processing temperatures can eliminate subsequent heat treatment. This is a major cost advantage particularly with certain automotive components. Mechanical properties developed by controlled hot working conditions are similar to those developed by conventional hardening and tempering treatments for components where strength and toughness are required

see HSLA steels