Cold Rolled

Overview

Cold Rolled Sheet Products are obtained in CSN from stripped hot rolled coils that have their thickness reduced in a cold strip rolling mill. The steel is severely work-hardened at this stage and recovers the ductility in subsequent annealing processes according to the requirements for mechanical properties and desired surface characteristics. CSN has continuous and high-convection, pure hydrogen box technologies for annealing plates and sheets. The benefits obtained from the use of such technology are high productivity, suitable thermal cycle, homogeneity of the resulting mechanical properties and surface cleaning, ensuring that the cold rolled product will meet standards and specifications for applications in the automotive, home appliances, construction and electronics industries.

The cold-rolled products can be supplied without annealing, at their work-hardened state ("full-hard" coil).

Continuous Plates Annealing Line at CSN

The cold-rolled products are supplied to the market in the form of coils or plates. Chemical composition, thermomechanical, cold reduction and subsequent annealing allows for the production of different specifications and dimensions of steel.

  • BFF - Thin coil, cold, thicknesses from 0.30 to 2.99 mm;
  • BFE - Superfine steel coil, cold rolled, thicknesses from 0.20 to 0.50 mm;

These products are supplied with natural lamination edges or trimmed, rough surface finish, matte or glossy, usually oiled for protection against rusting.

High Strength Steels


Product Description

These are high formability, low carbon steels that allow for smaller thicknesses efficiently, resulting in structure weight reduction compared to conventional steels.

Examples of application: in the automotive industry, in structural parts, such as struts or supports.

Available Dimensions and Examples of Standarts
Thickn. Min.
(mm)
Thickn. Max
(mm)
Lgth. Min
(mm)
Lgth. Max
(mm)
0.7 2.99 851 1400

The Combination of thickness x width will depend on the standard grade.

Technical Standard Grade Mechanical Properties
YS min
(MPA)
YS max
(MPA)
TS min
(MPA)
TS max
(MPA)
Elongation
Thc
(mm)
Gauge Length
(mm)
Value min
(%)
EN 10268 H280LA 280 360 370 NA Any 80 24
EN 10268 H320LA 320 410 400 NA Any 80 22
EN 10268/SEW 093 HC340LA 340 420 410 530 Any 80 21

- NA: Not Applicable

Bake Hardening Steels


Product Description

These are steels that combine mechanical strength and formability. Such materials, hardenable by aging during the curing of paint, allow for reduced thickness / weight without loss of resistance against dents. They have good formability due to the low initial values of yield strength. After the stamping of the piece during the paint curing phase, the yield strength increases, providing increased mechanical strength.

Application Example: doors, ceilings, vehicle hoods.

Available Dimensions and Examples of Standarts
Thickn. Min.
(mm)
Thickn. Max
(mm)
Lgth. Min
(mm)
Lgth. Max
(mm)
0.3 1.6 700 1280

The Combination of thickness x width will depend on the standard grade.
* Under technical consultation

Structural Steels


Product Description

These are low carbon steels with maximum strength of 470 MPa, associated with good toughness, formability and weldability. This class of products is intended for structural applications that require bending and stamping.

Application Examples: Shaped in the form of profiles, gussets or plates

Available Dimensions and Examples of Standarts
Thickn. Min
(mm)
Thickn. Max
(mm)
Lgth. Min
(mm)
Lgth. Max
(mm)
0.45 2.25 1000 1360

The Combination of thickness x width will depend on the standard grade.
NA: Not Applicable

Steels for Vitreous Enameling


Product Description

These are steels that can receive inorganic coating after the conformation of the parts, which gives the product high temperature, thermal shock, chemical attack and abrasion resistance, in addition to an aesthetic effect, ennobling its use in the manufacture of stoves, refrigerators, washing machines, heaters, signposts, the chemical industry, engine parts, architectural panels, industrial components, and many other applications.

Steels for enameling supplied by CSN stand out due to a very low hydrogen diffusion level while avoiding occurrence of "fish scales."

Application Examples: Enameled parts such as stove and oven interiors.

Available Dimensions and Examples of Standarts
Thickn. Min
(mm)
Thickn. Max
(mm)
Lgth. Min
(mm)
Lgth. Max
(mm)
0.45 2.99 1300 1555

The Combination of thickness x width will depend on the standard grade.
NA: Not Applicable

Steels for the Electric Purposes


Product Description

These are steels intended for electrical purposes with non-oriented grain, and feature magnetic properties optimized by heat treatment, increasing their performance and lifetime, and minimizing power consumption.

Application Examples: Small and medium size engines (in the automotive industry, home appliances, etc.), core hermetic compressors (refrigerators, freezers, air conditioners).

Available Dimensions and Examples of Standarts
Thickn. Min
(mm)
Thickn. Max
(mm)
Lgth. Min
(mm)
Lgth. Max
(mm)
0.50 1.2 800 1280

The Combination of thickness x width will depend on the standard grade

Specification Mechanical
Properties
Loss in the core
(W/Kg)
Hardness
(HV 5 Kg)
Epstein test after Heat Treatment
Thick.
(mm)
1,5 T/60 HZ 1,0 T / 60 Hz
Low
Efficiency
CSN MOT I 100 Min. 0,5 9 3,8
0,6 10 4,2
0,9 17 6,5
CSN MOT II 115 Min. 1 18 7,3
1,2 21 9
CSN MOT III 110 Min. 0,6 7,79 3,39
Average
Efficiency
CSN CORE
55700 II
150-210 0,5 5,8 2,5
CSN CORE
60900
110-150 0,6 8 3,1

Stamping (Extra Thin)


Product Description

These are average stamping steels with optimal mechanical properties for applications requiring high deformation through stamping process on the part of the customer. They are produced in thicknesses of 0.50 mm or less, with guaranteed flatness and roughness.

Application Examples: Stamping parts inside major appliances (stoves, freezers, refrigerators, air conditioners, microwaves), construction (window frames and fixtures), and other uses in general (gondolas, eyelets, etc.).

Available Dimensions and Examples of Standarts
Thickn. Min
(mm)
Thickn. Max
(mm)
Lgth. Min
(mm)
Lgth.Max
(mm)
0.38 0.50 700 1050

The Combination of thickness x width will depend on the standard grade

Technical Standard Grade Mechanical Property Chemical Composition
Hardness (HV5kg) C max
(%)
Mn max
(%)
P max
(%)
S max
(%)
NBR 5915 CSN LB 5565 51-65 0.1 0.5 0.03 0.05
CSN LBM 60 NA 0.08-0.13 0.03-0.60 0.03 0.05
CSN LB 50 NA 0.1 0.5 0.03 0.05
CSN LB 60 NA 0.1 0.5 0.03 0.05
CSN LB 65 NA 0.08-0.13 0.03-0.60 0.03 0.05

NA: Not Applicable

(CSN Extra Fino®) - Commercial Quality


Product Description

These are low-carbon steels processed with chemical composition ranges defined for application in low criticality parts and mechanical stress, produced in thicknesses of 0.55 mm or less.

Application Examples: Conformations and simple folding, re-rolling, pipes and construction

Available Dimensions and Examples of Standarts
Thickn. Min
(mm)
Thickn. Max
(mm)
Lgth. Min
(mm)
Lgth. Min
(mm)
0.38 0.55 700 1050

The Combination of thickness x width will depend on the standard grade

Technical Standard Grade Mechanical Property Chemical Composition
Hardness (HV5kg)
C max (%) Mn max (%) P max (%) S max (%) Al max (%)
SAE SAE 1006 NA 0.08 0.05 0.03 0.05 NA
SAE 1008 NA 0.10 0.50 0.03 0.05 NA
SAE 1010 NA 0.08-0.13 0.30 to 0.60 0.03 0.05 NA
NBR 6658 NA 0.15 0.60 0.04 0.04 NA
NBR 5915 ESQ 60 NA 0.10 0.50 0.03 0.05 NA
CSN DTB 06 NA 0.08 0.45 0.03 0.05 NA
CSN DTB 08 NA 0.10 0.50 0.03 0.05 NA
CSN DTB M61 65 0.13 0.60 0.03 0.03 0.01
CSN REL 50 65 0.08 0.45 0.03 0.05 NA

NA: Not Applicable

Commercial Quality


Product Description

These are steels with guaranteed chemical composition with control of hardness range.

Application Examples: Body and cover of drums, wheelbarrows, buckets and stamped materials in general.

Available Dimensions and Examples of Standarts
Thickn. Min
(mm)
Thickn. Max
(mm)
Lgth. Min
(mm)
Lgth. Max
(mm)
0.3 1.6 700 1280

The Combination of thickness x width will depend on the standard grade

Standard Grade Mechanical Property Chemical Composition
Hardness (HRB)
C max (%) Mn max (%) P max (%) S max (%) Al max (%)
NBR 5915 CSN TBR 55 40-55 0.1 0.5 0.03 0.05 0.02
CSN TBR 60 40-60 0.1 0.5 0.03 0.05 0.02

Last Update on October 27, 2016

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