EN 10139 Standard Guide

Cold Rolled Uncoated Low Carbon Steel Narrow Strip for Cold Forming – Technical Delivery Conditions

1. Scope

Product Type	Cold rolled uncoated low carbon steel narrow strip
Width	Less than 600 mm
Thickness Range	Up to 10 mm
Delivery Forms	Coils, cut lengths, bobbin wound coils
Application	Cold forming and surface coating (not suitable for hardening/tempering)

Aspect	EN 10139 (This Standard)	EN 10130
Width	< 600 mm (Narrow strip)	≥ 600 mm (Wide products)
Max Thickness	10 mm	3 mm (unless agreed)
Delivery Conditions	A, LC, C290-C690 (10 options)	Skin-passed or non-skin-passed
Surface Quality	MA, MB, MC	A, B

This is a KEY FEATURE of EN 10139 – Multiple delivery conditions available:

Symbol	Condition	Description / Application
A	Annealed	Soft condition, best formability. For DC01, DC03, DC04 only.
LC	Skin-passed	Lightly skin-passed after annealing. Prevents stretcher strain marks. All grades available.
C290	Work hardened	Tensile strength 290-430 MPa (DC01) / 290-390 MPa (DC03, DC04)
C340	Work hardened	Tensile strength 340-490 MPa (DC01) / 340-440 MPa (DC03, DC04)
C390	Work hardened	Tensile strength 390-540 MPa (DC01) / 390-490 MPa (DC03, DC04)
C440	Work hardened	Tensile strength 440-590 MPa (DC01) / 440-540 MPa (DC03, DC04)
C490	Work hardened	Tensile strength 490-640 MPa (DC01) / 490-590 MPa (DC03, DC04)
C590	Work hardened	Tensile strength 590-740 MPa (DC01) / min 590 MPa (DC03) / 590-690 MPa (DC04)
C690	Work hardened	Tensile strength min 690 MPa. Only available for DC01. Higher strength application.

Grade	C	Mn	P	S	Ti	Notes
DC01	0.12	0.60	0.045	0.045	–	May contain B or Ti; C690 may exceed C, Mn
DC03	0.10	0.45	0.035	0.035	–	May contain B or Ti
DC04	0.08	0.40	0.030	0.030	–	May contain B or Ti
DC05	0.06	0.35	0.025	0.025	–	May contain B or Ti
DC06	0.02	0.25	0.020	0.020	0.3	Ti may be replaced by Nb
DC07	0.01	0.20	0.020	0.020	0.2	Ti may be replaced by Nb

Properties for the most common delivery condition:

For 0.5 mm < t ≤ 0.7 mm: Re increases by 20 MPa, A80 decreases by 2%, HV increases by 5
For t ≤ 0.5 mm and > 0.25 mm: Re increases by 40 MPa, A80 decreases by 4%, HV increases by 10
For t ≤ 0.25 mm and > 0.15 mm: A80 decreases by 6%
For t ≤ 0.15 mm: A80 decreases by 8%
For DC04 with t > 1.5 mm: Re max = 235 MPa
For surface MB and MC: Re and Rm increase by 20 MPa, A80 decreases by 2%, HV increases by 5

Grade	Property Validity Period	Stretcher Strain Protection
DC01	3 months from availability	3 months (LC condition)
DC03	6 months from availability	6 months (LC condition)
DC04	6 months from availability	6 months (LC condition)
DC05	6 months from availability	6 months (LC condition)
DC06	No limit	No stretcher strain marks at any time
DC07	No limit	No stretcher strain marks at any time

Symbol	Thickness	Conditions	Description
MA	All thicknesses	All delivery conditions	Bright, metallically clean. Pitting, grooves, scratches permitted.
MB	≤ 2.0 mm (standard); > 2.0 mm by agreement	All except A	Bright, clean, uniform smooth appearance. Minor defects OK if not visibly impairing.
MC	≤ 1.0 mm (standard); > 1.0 mm by agreement	All except A	Mirror finish. Bright, clean. Defects not impairing mirror appearance.

Products normally supplied oiled (both sides)
Non-drying neutral oil, uniformly spread
Corrosion protection: 3 months under normal packing/transport/storage conditions
Oil removable by alkaline solution or normal solvents
Unoiled supply available by request (increased scratching and rust risk)
Delivery condition A has only traces of rolling oil

Coating Type	Requirements
Organic coating	All products suitable
Metallic coating (hot dip/thermal spray)	All products suitable (zinc, tin, lead). Note: Work hardened conditions C290-C690 may experience recovery/recrystallization at elevated temperatures.
Electrolytic coating	Products with surface appearance MB or MC only

Tensile test for each acceptance unit
Alternatively, hardness test (if agreed at ordering)
Determination of r and n values (if agreed, for thickness > 0.5 mm and width > 250 mm)

Tensile test: EN ISO 6892-1:2009 (longitudinal test pieces, parallel to rolling direction)
Hardness test: EN ISO 6507 (Vickers)
Surface roughness: EN 10049
r and n values: ISO 10113 and ISO 10275
All tests at ambient temperature

Designation format: Product form + EN 10140 dimensions + Steel EN 10139 + Grade + Condition + Surface + Finish

Example	Description
Narrow strip EN 10140:2006 – 1,50 × 200 – GK Steel EN 10139 – DC04 + LC – MB – RM	1.5mm thick, 200mm wide, slit edges, DC04 steel, skin-passed, smooth uniform surface, matt finish
Narrow strip EN 10140:2006 – 2,00 × 450 – GK Steel EN 10139 – DC03 + A – MA – RL	2.0mm thick, 450mm wide, slit edges, DC03 steel, annealed, bright clean surface, smooth finish
Narrow strip EN 10140:2006 – 0,80 × 150 – GK Steel EN 10139 – DC01 + C390 – MA	0.8mm thick, 150mm wide, slit edges, DC01 steel, work hardened C390, bright clean surface

Grade	Available Conditions	Typical Applications	Key Features
DC01	A, LC, C290-C690	General purpose, simple forming, structural components	Most versatile – all strength levels available
DC03	A, LC, C290-C590	Good formability applications	Better formability than DC01
DC04	A, LC, C290-C590	Complex forming, deep drawing	Excellent formability
DC05	LC only	Very complex deep drawing	Superior formability
DC06	LC only	Extra deep drawing, extreme forming	No stretcher marks, best r value
DC07	LC only	Most demanding deep drawing	Highest formability, no stretcher marks