HX340LAD+Z/+ZF/+ZM
Specification details for HX340LAD+Z/+ZF/+ZM

EN-Engineering-Product-Metallic coated-HSS-All Grades OverviewTSE

Overview

Relationship with standards

European standard

 

EN 10346:2015

 

Phosphorus alloyed interstitial-free

For phosphorus alloyed 
interstitial-free grades,
bake-hardening grades
and phosphorus alloyed grades,
please visit the Automotive HSS page.

HX220YD+Z/+ZF/+ZM

HX260YD+Z/+ZF/+ZM

Bake-hardening

HX180BD+Z/+ZF/+ZM

HX220BD+Z/+ZF/+ZM

HX260BD+Z/+ZF/+ZM

HX300BD+Z/+ZF/+ZM

Phosphorus alloyed

HX220PD+Z 1

HX260PD+Z 1

HX300PD+Z 1

Micro-alloyed

 

 

 

 

 

 

 

 

 

HX220LAD+Z/+ZF/+ZM 1

HX260LAD+Z/+ZF/+ZM

HX300LAD+Z/+ZF/+ZM

HX340LAD+Z/+ZF/+ZM

HX380LAD+Z/+ZF/+ZM

HX420LAD+Z/+ZM

HX460LAD+Z/+ZM

HX500LAD+Z/+ZM

1. Not in EN 10346:2015. Tata Steel’s own specification.

EN-Engineering-Product-Metallic coated-All Grades Coatings Surface aspectsTSE

Coatings and surface aspects

Coatings

Three types of metallic coating are available:

Pure zinc

Galvanised steel (+Z) is coated with an almost pure zinc coating (>99% zinc).

Zinc-iron alloy

Galvannealed steel (+ZF) is coated with a zinc coating containing approximately 8-12% iron. 
For further information on our galvannealed products please visit our Automotive catalogue.

MagiZinc

MagiZinc steel (+ZM) is coated with a zinc coating containing additional magnesium and aluminium.
 

Coating weight

Coating Minimum Maximum
Pure zinc (Z) 90 (6 µm/side) 600 (42 µm/side)
Zinc-iron (ZF) 90 (6 µm/side) 140 (10 µm/side)
MagiZinc (ZM)1 70 (5 µm/side) 310 (22 µm/side)
Coating weight measured in g/m2 double-sided (µm, per side).
Coils with coatings > 450 g/m2 will be supplied in oscillated coiled condition.
Coils coated with 600 g/m2 are only available in width range 980 to 1300 mm.
For MagiZinc (ZM) coating weights below 100 g/m2 please visit our Automotive catalogue
 

Surface quality

Surface quality complies with standard: EN 10346:2015. Galvanised steels are available in surface quality A, B or C.
For the highest surface quality requirements we also offer Serica FLO®. For more details please visit our Automotive catalogue.

Surface quality A: as coated surface

Imperfections such as pimples, marks, scratches, pits, variations in surface appearance, dark spots, stripe marks and light passivation stains are permissible.
Stretch levelling breaks or run-off marks may appear. Coil breaks and stretcher strains may also appear.

Surface quality B: improved surface

With this surface quality, small imperfections such as stretch levelling breaks, skin pass marks, slight scratches, indentations, surface structure, zinc run-off marks and light passivation stains are permissible.

Surface quality C: best quality surface

For more information on surface quality C please visit our Automotive catalogue.

 

Surface finish

Pure zinc

MA: minimised spangle, as coated surface (Z).
MB: minimised spangle, improved surface (Z).
MC: minimised spangle, best quality surface (Z).

Zinc-iron alloy

A: as coated surface (ZF).
B: improved surface (ZF).
C: best quality surface (ZF).

MagiZinc®

A : as coated surface (ZM).
B : improved surface (ZM).
C: best quality surface (ZM).

 

Surface roughness

Metallic coated steel (with the exception of galvanised steel with standard surface (MA)) can be supplied in various grades of roughness – please contact us for more details. If no roughness is specified, roughness will be as shown in the table below.

Roughness Ra (µm)

 

cut off 0.8mm

cut off 2.5mm

0.6 - 1.9

0.7 - 2.2

 

Surface treatments

The surface treatments available are O, C and CO.

Oiling (O)

The material surface can be oiled with preservative oil. Other types of oil - for increasing strength or reducing weight – are available to help achieve your optimum performance parameters. Please contact us for details.

Tata Steel offers the following range of oiling levels:

Coating type

Capability

Pure zinc (Z)

0.25 - 1.5 g/m2

Zinc-iron (ZF)

0.5 - 1.5 g/m2

MagiZinc® (ZM)

0.25 - 1.5 g/m2

Other oiling levels are available on request.

Chromium-free passivation (C)

This surface treatment temporarily protects the zinc-coated material against white rust during transportation and storage (not applicable to all qualities and dimensions – please contact us for details).

Chromium-free passivation and oiled (CO)

Please request this combination of surface treatments if you require extra protection against white rust formation (not applicable to all qualities and dimensions – please contact us for details).

Untreated (U)

Please contact us regarding the availability of untreated coils.

EN-Engineering-Product-Metallic Coated-HSS-HX340LAD-Properties TSE

Properties

Properties


Mechanical properties

Metallic coated high-strength steel grades have the following mechanical properties (skin-passed) - these are measured transverse to the rolling direction:

Micro-alloyed steels
European standard EN 10346:2015  Grade HX340LAD+Z/+ZF/+ZM
Yield strength ReL N/mm2 340 - 420
Min. BH2 N/mm2 -
Tensile strength Rm N/mm2 410 - 510
Elongation % 21
Min. r-value -
Min. n-value -
Lower yield strength or 0.2% proof stress applies.
BH2 refers to the increase of 0.2% proof stress after heating (bake hardening). Not applicable for hot rolled substrate.
For galvannealed grades (ZF) the minimum elongation before fracture is lowered by 2%.
For galvannealed grades (ZF) the minimum r90-value is lowered by 0.2.
 

Chemical composition

Tata Steel supplies the following cast analysis with maximum values unless otherwise shown:

Micro-alloyed steels
EN 10346:2015 Grade HX340LAD+Z/+ZF/+ZM
C Max. 0.11
Mn Max. 1.00
Si Max. 0.50
P Max. 0.03
S Max. 0.025
Altot Min. 0.015
Ti Max.