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HIGH STRENGTH STEEL

Docol, Domex, Weldox (Strenx), Hardox and Supraform



High strength steel contains low carbon with minimum molybdenum, niobium, titanium and or vanadium content.

The following are seen as high strength steels:

Domex

Domex, a high strength steel consisting of properties suitable for cold forming, machining as well as welding. The production of the end-product is improved by these properties. The load capcaity of an end product manufactured from Domex steel plate will not be influenced by the reduced weight.

Various Domex grades are available in the market due to regular refining and development that ensure continuous availability of improved and better Domex grades.

Mechanical Properties

Grade: Thickness (mm) Yield Strength Rp0.2 (N/mm2) Tensile Strength Rm (N/mm2) Elongation A80 (min %) Min. bending radius for 90° (Ri/t)
420MC 1.80 - 3.00 420 480 - 620 16 0.4xt
3.01 - 6.00 420 480 - 620 0.5xt
6.01 - 15.00 420 480 - 620 0.8xt
460MC 2.00 - 3.00 460 520 - 670 15 0.5xt
3.01 - 6.00 460 520 - 670 0.7xt
6.01 - 13.00 460 520 - 670 0.9xt
40.01 - 63.00 390 500 - 660 19 -
500MC 2.00 - 3.00 500 550 - 700 14 0.6xt
3.01 - 6.00 500 550 - 700 0.8xt
6.01 - 13.00 500 550 - 700 1.0xt
550MC 2.00 - 3.00 550 600 - 760 14 0.5xt
3.01 - 6.00 550 600 - 760 1.0xt
6.01 - 12.8 550 600 - 760 1.2xt

Chemical Composition

Grade C (max %) Si (max %) Mn (max %) P (max %) S (max %) Al (min %) Nb (max %) V (max %) Ti (max %)
420MC 0.10 0.03 1.50 0.025 0.010 0.015 0.09 0.20 0.15
460MC 0.10 0.03 1.50 0.025 0.010 0.015 0.09 0.20 0.15
500MC 0.10 0.21 1.60 0.025 0.010 0.015 0.09 0.20 0.15
550MC 0.12 0.21 1.80 0.025 0.010 0.015 0.09 0.20 0.15

Docol

In industries, like automotive, where new demands are high and difficult to meet, Docol can be used toincrease the cost efficiency with a lightweight design and safety improvements. The high strength-to-steel ratio of Docol makes it one of the strongest high-strength steels available. The weight of products can be reduced without losing the strength required.

Docol also forms part of the Domex family with thickness ranging from 0.5 to 2.1mm, with good weldability, formability and it is suitable for laser cutting.

Applications for Docol include:

  • Forming and welding
  • Automotive applications
  • Car safety components
  • Tubes

Mechanical Properties

Grade Yield Strength Rp0.2 (N/mm2) Yield Strength after bake hardening (min N/mm2) Tensile Strength Rm(N/mm2) Elongation A80 (min%) Min. bending radius for 90° (Ri/t)
Docol 500DP 290 - 370 400 500 - 600 20 0xt
Docol 600DL 280 - 360 450 600 - 700 20 0xt
Docol 600DP 350 - 450 500 600 - 700 16 0xt
Docol 800DL 390 - 540 550 800 - 950 13 1xt

Chemical Composition

Grade C (%) Si (%) Mn (%) P(%) S (%) Altot (%) Nb (%)
Docol 500DP 0.08 0.30 0.65 0.010 0.010 0.040
Docol 600DL 0.10 0.40 1.50 0.010 0.002 0.040
Docol 600DP 0.10 0.20 0.80 0.010 0.002 0.040 0.015
Docol 800DL 0.14 0.20 1.50 0.010 0.002 0.040 0.015

Hardox

Hardox contains the unique quality of hardness combined with toughness, setting the standard for the rest of abrasion and wear resistant steel. Various applications can benefit from Hardox steel plate where it functions as a load bearing part as well as perform in wear resistant environments.

It is guaranteed that the core of the Hardx steel plate is a minimum of 90% that of the surface hardness

Mechanical Properties

Grade Thickness (mm) Hardness (HBW) Yield Strength (Mpa) Longitudinal test, typical impact energy, Charpy V 10 x 10mm
400 Plate 3.20 - 130.0 370 - 430 900 - 1100 45 J/-40°C
450 Plate 3.20 - 80.0 425 - 475 1100 - 1300 50 J/-40°C
500 Plate 4.00 - 32.0 470 - 530 1250 - 1400 37 J/-40°C
32.10 - 103.0 450 - 540 1250 - 1400
600 8.00 - 51.0 570 - 640
51.10 - 65.0 550 - 640

Chemical Composition (Heat Analysis)

Grade C (max %) Si (max %) Mn (max %) P (max %) S (max %) Cr (max %) Ni (max %) Mo (max %) B(max %)
400 0.32 0.70 1.60 0.025 0.010 1.40 1.50 0.60 0.004
450 0.26 0.70 1.60 0.025 0.010 1.40 1.50 0.60 0.005
500 0.30 0.70 1.60 0.020 0.010 1.50 1.50 0.60 0.005
600 0.47 0.70 1.40 0.015 0.010 1.20 2.50 0.70 0.005

Supraform

There are four grades in the Supraform MC range, where the number in the name refers to the minimum yield strength of that specific grade. Improved formability, good weldability and the toughness of the steel are the effect of low carbon content. The Suprafrom range is known as a high strength, low alloy steel used in mining equipment, automotive industry, truck industry and in various other applications.

The Domex range, explained in the first section of the page, and the Supraform range are equivalent to one another.

Mechanical Properties

Grade Min Yield Strength (MPa) Tensile Strength (MPa) Min Elongation <3mm Lo = 80mm Mandrel Diameter for 180° bend test, t = strip thickness
S315 MC 315 390 - 510 20 0t
S355 MC 355 430 - 550 19 0.5t
S420 MC 420 480 - 620 16 0.5t
S550 MC 550 600 - 760 12 1.0t

Chemical Composition

Grade C max(%) Mn max(%) P max(%) S max(%) Si max(%) Al max(%) V max(%) Ti max(%) Nb max(%)
S315 MC 0.12 1.30 0.025 0.020 0.50 0.015 0.200 0.150 0.090
S355 MC 0.12 1.50 0.025 0.020 0.50 0.015 0.200 0.150 0.090
S420 MC 0.12 1.60 0.025 0.015 0.50 0.015 0.200 0.150 0.090
S550 MC 0.12 1.80 0.025 0.015 0.50 0.015 0.200 0.150 0.090
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