EN 10111 Standard Guide

Continuously Hot Rolled Low Carbon Steel Sheet and Strip for Cold Forming – Technical Delivery Conditions

1. Scope

Product Type	Continuously HOT ROLLED low carbon steel sheet and strip
Width Classification	Wide strip: ≥ 600 mm / Slit wide strip: < 600 mm
Thickness Range	1.0 mm to 11 mm
Delivery Form	Coils (continuous strip)
Application	Cold forming operations

CRITICAL DISTINCTION: Hot Rolled vs Cold Rolled

Aspect	EN 10111 (HOT ROLLED)	EN 10130 (COLD ROLLED)
Process	Hot rolling (above recrystallization temp)	Cold rolling (room temperature)
Grades	DD11, DD12, DD13, DD14	DC01, DC03, DC04, DC05, DC06, DC07
Thickness Range	1.0 – 11 mm	0.35 – 3 mm (standard)
Surface Condition	As-rolled with scale OR descaled	Clean, smooth surface
Tolerances	EN 10051 (wider tolerances)	EN 10131 (tighter tolerances)
Typical Cost	Lower cost	Higher cost (more processing)

2. Steel Grades (DD Series)

Note: HOT rolled uses DD grades, COLD rolled uses DC grades

Steel Name	Steel Number	Deoxidation	Formability
DD11	1.0332	Manufacturer’s discretion	Basic
DD12	1.0398	Fully killed	Good
DD13	1.0335	Fully killed	Very good
DD14	1.0389	Fully killed	Excellent

3. Chemical Composition (Ladle Analysis, Max %)

Grade	C	Mn	P	S
DD11	0.12	0.60	0.045	0.045
DD12	0.10	0.45	0.035	0.035
DD13	0.08	0.40	0.030	0.030
DD14	0.08	0.35	0.025	0.025

Important Note:

Nitrogen-fixing elements (Ti, B) may be added at manufacturer’s discretion unless otherwise agreed

4. Mechanical Properties

IMPORTANT: Properties vary by thickness range!

4.1 Yield Strength ReL (MPa)

Grade	1.0 mm ≤ t < 2 mm	2 mm ≤ t ≤ 11 mm
DD11	170 – 360	170 – 340
DD12	170 – 340	170 – 320
DD13	170 – 330	170 – 310
DD14	170 – 310	170 – 290

4.2 Tensile Strength Rm (MPa) – All Thicknesses

Grade	Rm max (MPa)
DD11	440
DD12	420
DD13	400
DD14	380

4.3 Elongation After Fracture (Min %)

Values depend on both thickness AND gauge length:

Grade	1.0≤t<1.5 L₀=80mm	1.5≤t<2 L₀=80mm	2≤t<3 L₀=80mm	3≤t≤11 L₀=80mm	3≤t≤11 L₀=5.65√S₀
DD11	22	23	24	28	–
DD12	24	25	26	30	6
DD13	27	28	29	33	6
DD14	30	31	32	36	6

4.4 Property Validity Period

Grade	Validity Period
DD11	Form within 6 weeks recommended (no guarantee)
DD12, DD13, DD14	6 months from availability date

5. Delivery Conditions

5.1 Surface Condition

Condition	Description
As-rolled (Standard)	Thin layer of scale with variable coloration. Standard delivery condition.
Descaled (By agreement)	Scale removed. Usually oiled. Available with trimmed edges (GK designation).
Skin-passed (Optional)	Light cold reduction pass. May be applied to either as-rolled or descaled.

5.2 Oiling (Descaled Products)

Descaled products usually delivered oiled (both surfaces)
Neutral non-drying oil, free of impurities, uniformly spread
Corrosion protection: 3 months under normal conditions
Oil removable by alkaline solutions or usual solvents
Unoiled delivery available on request (increased corrosion and scratch risk)

6. Surface Quality Requirements

Products shall be free from defects that would adversely affect use:

Prohibited Defects:

Slivers
Blow holes
Seams
Cracks or scratches that adversely affect use
Defects causing failure, tooling damage, or welding difficulties

Permitted Minor Defects:

Pores
Small pits
Small marks
Small scratches
Kinks from pay-off reels
Slight coloration

Important Note:

Coil delivery may have higher percentage of surface defects than sheet delivery
Maximum rejection percentage should be agreed at time of order for coils

7. Surface Coating and Weldability

7.1 Surface Coating Suitability

Suitable for metallic coating: hot dipping, electrodeposition
Suitable for organic coatings
Coating type must be specified at time of enquiry and order

7.2 Weldability

Suitable for standard welding processes
Welding process should be specified at enquiry/order (especially gas welding)
For non-descaled products: welding process must account for scale layer
Structural safety requirements should be specified if relevant

8. Testing and Inspection

8.1 Inspection Units

Steel Grade	Inspection Unit (tonnes)
DD11	150 tonnes
DD12	100 tonnes
DD13	60 tonnes
DD14	40 tonnes

8.2 Required Tests

Tensile test (mandatory)
Product chemical analysis (by agreement at enquiry/order)

8.3 Test Methods

Tensile test: EN 10002-1
Test pieces taken transverse to rolling direction (unless otherwise agreed)
For t < 3 mm: Type 2 test piece (L₀=80mm, width=20mm)
For t ≥ 3 mm: Proportional test piece (L₀=5.65√S₀, max width 30mm)
Chemical composition: EN ISO 14284

9. Product Designation

Designation format: Product type + EN 10111 + Steel grade (name or number)

Example	Description
Strip EN 10111 – DD13	Hot rolled strip, grade DD13
Strip EN 10111 – 1.0335	Hot rolled strip, steel number 1.0335 (DD13)
Sheet EN 10111 – DD12	Hot rolled sheet, grade DD12

10. Storage and Transportation

CRITICAL: Moisture control is essential!

Moisture, especially condensation between sheets/laps, causes corrosion products
Products must be transported and stored DRY
Protect from moisture at all times
Particularly important for as-rolled (non-oiled) products

11. Information Required from Purchaser

11.1 Mandatory Information

Full designation (product type + EN 10111 + grade)
Nominal dimensions and ordered quantities
If inspection documents required and their type (EN 10204)
Special requirements for packing and marking
Limits on mass and sizes of coils/bundles

11.2 Optional Information

If products to be supplied skin-passed
If products to be supplied descaled
If products to be supplied with sheared edges
If oiling not required (descaled products)
If suitable for making specific part
If external inspection required at manufacturer’s works
Intended application (surface coating, welding technique)

12. Quick Reference – Grade Selection Guide

Grade	Formability	Typical Applications	Key Features
DD11	Basic	General purpose, simple bending, light forming	Most economical, form within 6 weeks, thickest available (up to 11mm)
DD12	Good	Moderate forming, bending operations	Fully killed, 6 months property guarantee
DD13	Very good	Complex forming, drawing operations	Higher elongation, automotive applications
DD14	Excellent	Deep drawing, severe forming	Best formability, lowest strength, demanding applications