Docol® 550LA high strength low alloy

General Product Description

The Docol 550LA steels are high-strength low-alloy steels that offer consistent properties for modern, rapid production methods. Typical applications include bent profiles. Docol HR550LA-UC can after agreement be adapted and delivered as dual certified with S550MC according to EN 10149-2.

Dimension Range

Hot rolled / UC: thickness 2.00-6.00 mm, width up to 1600 mm.

Hot rolled / GI: thickness 2.00-5.00 mm, width up to 1500 mm.

Slit strip and cut to length sheets are available upon request.

Grade and coating specific restrictions on available dimensions may occur.

Mechanical Properties

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	Standard	Coating	Test direction	Yield strength R_p0.2 (MPa)	Tensile strength R_m (MPa)	Elongation A₈₀¹⁾ (min %)	Elongation A₅³⁾ (min %)	Min. inner bending radius for a 90° bend⁴⁾
Docol HR550LA	VDA 239-100	UC, GI*	L	550 - 670	610 - 750	12 ²⁾	16 ²⁾	1.0 x t

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Coating

Test direction

Yield strength R_p0.2
(MPa)

Tensile strength R_m
(MPa)

Elongation A₈₀¹⁾
(min %)

Elongation A₅³⁾
(min %)

Min. inner bending radius for a 90° bend⁴⁾

Docol HR550LA

Standard

VDA 239-100

Coating

UC, GI*

Test direction

L

Yield strength R_p0.2
(MPa)

550 - 670

Tensile strength R_m
(MPa)

610 - 750

Elongation A₈₀¹⁾
(min %)

12 ²⁾

Elongation A₅³⁾
(min %)

16 ²⁾

Min. inner bending radius for a 90° bend⁴⁾

1.0 x t

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* Available upon request.

¹⁾ A₈₀ value applies for thicknesses < 3.00 mm.

²⁾ For GI coatings the minimum elongation value is reduced by 1 unit.

³⁾ A₅ value applies for thicknesses ≥ 3.00 mm.

⁴⁾ In some cases tight bending radius may cause micro-cracking of the coating in the bend area. Where design permits, users are encouraged to employ larger radius.

Chemical Composition (ladle analysis)

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	Coating	C (max %)	Si (max %)	Mn (max %)	P (max %)	S (max %)	Al (%)	Ti (max %)	Nb (max %)	Cu (max %)
Docol HR550LA	UC	0.12	0.60	1.80	0.025	0.025	From 0.015	0.15	0.09	0.20
Docol HR550LA	GI*	0.12	0.60	1.80	0.030	0.025	From 0.015	0.15	0.10	0.20

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C
(max %)

Si
(max %)

Mn
(max %)

P
(max %)

S
(max %)

Al
(%)

Ti
(max %)

Nb
(max %)

Cu
(max %)

Docol HR550LA

Coating

UC

C
(max %)

0.12

Si
(max %)

0.60

Mn
(max %)

1.80

P
(max %)

0.025

S
(max %)

0.025

Al
(%)

From 0.015

Ti
(max %)

0.15

Nb
(max %)

0.09

Cu
(max %)

0.20

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Docol HR550LA

Coating

GI*

C
(max %)

0.12

Si
(max %)

0.60

Mn
(max %)

1.80

P
(max %)

0.030

S
(max %)

0.025

Al
(%)

From 0.015

Ti
(max %)

0.15

Nb
(max %)

0.10

Cu
(max %)

0.20

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* Available upon request.

Tolerances

Hot rolled (UC): Tolerances in accordance to EN 10051.

Hot-dip galvanized (GI): Tolerances in accordance to EN 10143.

Customized dimensional and shape tolerances are available upon request.

Coatings

The metal coating options for Docol products include:

Hot-dip zinc coating (GI) consists almost entirely of zinc (>99%). It is lead free, resulting in a small zinc spangle size. The coating provides good corrosion protection.

Grade specific availability of metal coatings for Docol products is given in the Mechanical properties table (Coating).

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Coating type	Coating class	Standard	Closest in EN 10346, informative	Coating mass per side, single spot test (g/m²)	Thickness per side informative (µm)
GI	40/40	VDA 239-100	Z100	40 - 60 ¹⁾	5.6 - 8.5
GI	50/50	VDA 239-100	—	50 - 70 ¹⁾	7.0 - 9.9
GI	60/60	VDA 239-100	Z140	60 - 90	8.5 - 12.7
GI	70/70	VDA 239-100	—	70 - 100	9.9 - 14.1
GI	85/85	VDA 239-100	—	85 - 115	12.0 - 16.2
GI	115/115	VDA 239-100	Z275	115 - 155	16.2 - 21.8

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Coating class

Standard

Closest in EN 10346, informative

Coating mass per side, single spot test (g/m²)

Thickness per side informative (µm)

Coating type

GI

Coating class

40/40

Standard

VDA 239-100

Closest in EN 10346, informative

Z100

Coating mass per side, single spot test (g/m²)

40 - 60 ¹⁾

Thickness per side informative (µm)

5.6 - 8.5

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Coating type

GI

Coating class

50/50

Standard

VDA 239-100

Closest in EN 10346, informative

—

Coating mass per side, single spot test (g/m²)

50 - 70 ¹⁾

Thickness per side informative (µm)

7.0 - 9.9

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Coating type

GI

Coating class

60/60

Standard

VDA 239-100

Closest in EN 10346, informative

Z140

Coating mass per side, single spot test (g/m²)

60 - 90

Thickness per side informative (µm)

8.5 - 12.7

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Coating type

GI

Coating class

70/70

Standard

VDA 239-100

Closest in EN 10346, informative

—

Coating mass per side, single spot test (g/m²)

70 - 100

Thickness per side informative (µm)

9.9 - 14.1

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Coating type

GI

Coating class

85/85

Standard

VDA 239-100

Closest in EN 10346, informative

—

Coating mass per side, single spot test (g/m²)

85 - 115

Thickness per side informative (µm)

12.0 - 16.2

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Coating type

GI

Coating class

115/115

Standard

VDA 239-100

Closest in EN 10346, informative

Z275

Coating mass per side, single spot test (g/m²)

115 - 155

Thickness per side informative (µm)

16.2 - 21.8

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Docol metal coated products are available with surface quality for unexposed applications.

In addition to these coating masses, OEM specific coatings are available upon request.

¹⁾ For hot-dipped (GI, ZA, GA) hot rolled (HR) grades, the coating mass tolerance is increased to 30 g/m² by increasing the upper limit.

Surface Treatments

Uncoated (UC): available as oiled.

Hot-dip galvanized (GI): available as oiled and/or chemically passivated.

All surface treatments are in accordance with RoHS directive (2011/65/EU) and do not contain Chromium VI (Cr⁶⁺). Surface treatments provide only temporary surface protection during transportation and storage. In order to avoid corrosion damages, care must be taken to keep the products dry during transportation and storage. If they become wet, they must be separated and situated so that they are dried quickly.

Fabrication and Other Recommendations

For information concerning fabrication, see SSAB´s brochures on www.ssab.com or consult Tech Support.

Appropriate health and safety precautions must be taken when bending, welding, cutting, grinding or otherwise working on the products.

Docol® 550LA high strength low alloy

General Product Description

Dimension Range

Mechanical Properties

Select one parameter to compare

Chemical Composition (ladle analysis)

Select one parameter to compare

Tolerances

Coatings

Select one parameter to compare

Surface Treatments

Fabrication and Other Recommendations

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