VA-High-strength heavy platesHochfesterStahl_E_02062008[1](2)

Heat analysis Guaranteed values

mass %

C

Si Mn P S Al ges.Cr Mo Ni V Nb Ti

B Steel grades max.max.max.max.max.min.max.max.max.max.max.max.max.alform 700 M 0.120.60 2.100.0200.0080.020 1.500.50 2.000.120.060.050.0050alform 960 M

0.12

0.60

1.70

0.020

0.008

0.020

1.50

0.70

2.00

0.12

0.06

0.05

0.0050

As-delivered condition

Plates of alform 700 M are delivered in a thermomechanically rolled condition with accelerated cooling.

Plates of alform 960 M are delivered in a thermomechanically rolled condition with accelerated cooling and tempering. Mechanical properties

1)Tensile test in accordance with EN 10002 on transverse samples.

2)Notch impact bending test in accordance with EN 10045 on Charpy-V longitudinal samples at –40 °C.

The mean value from 3 inpidual sampels must fullfil the specified requirements. No inpidual value below 70% of the guaranteed

mean value. For thicknesses < 10 mm, samples similar to Charpy-V with dimensions of 10 x 7.5 mm are tested. The guaranteed value

is reduced in proportion to the sample cross-section.

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18Safety at overload

alform 700 M provide a low ratio of yield strength to tensile strength. This aims in additional safety in case of overload.

Excellent toughness

alform 700 M provide excellent toughness down to very low temperatures. Skillfully welded this aims also in high toughness in the heat-affected zone (HAZ) for a reliable welded joint.

Item 1

With beginning overload alform 700 M strengthens

more, but with less elongation than S690QL.

Item 2

Increasing overload reaches the tensile strength for

S690QL while alform 700 M is still strengthening.

Item 3

While alform 700 M is still strengthening, the tensile

strength of S690QL is already passed.

Elongation

Stress strain curves (detail)

S t r e s s [M P a ]

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Optimal Welding

Reduced preheating

The very low carbon- and carbon equivalent values reduce the preheating temperature significantly or even make pre-heating not necessary. This saves fabrication costs and improves the working environment of the operator.

Lower hardening

Due to the lean chemical composition the hardening in the heat-affected zone (HAZ) during welding ist remarkable lower compared with conventional quenched and tempered steels. This results in lower risk of cold cracks and a reliable welded joint.

Arc energy [kJ/mm ]

M a x . h a r d n e s s i n H A Z [H V 10]

Hardening in heat-affected zone [HAZ]

MAW – welding, 12 mm thickness

20Tests for alform 700 M: plate thickness of 10 mm, bending direction parallel to rolling direction

Q+T steel plates: Quenching & tempering leads

to thick scale from the furnace. During levelling

there is a risk of getting marks of impressed

scale. alform ?-plates: TMCP provides thin homogene-ous scale from hot rolling. The risk of scale im-pressions is reduced.

Best bending properties

The fine-grained structure of alform ?-steels provides very good cold formability. We recommend a minimum die-radius of: 3 x plate thickness for alform 700 M (EN 10025-6: 4 x)4 x plate thickness for alform 960 M (EN 10025-6: 5 x)

Less scale on surface

Due to the TMCP online-production with accelerated cooling alform ?-plates provide a thin homogeneous scale. This results in less scale during processing in the costumer’s workshop.

measured inner radius / thickness

(c r

a c k

l

e n g t h / b e n d i n g l e n g t h ) x 100 [%]100

9080706050403020100

Bending performance

10 mm 10 mm

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