S460ML

S460ML Steel Plate

S460ML thermomechanically-rolled fine-grain, high yield strength structural steel plates, good weldability and high resistance to brittle cracking.

Typically used above all for highly stressd welded structures in the construction of bridges and steel structres.

The cryogenic grades S...ML are available for special applications at temperatures below -20 °C.

The user of these steel grades must make sure that his calculation, design and processing methds are appropriate for the material.

The welding technique used must be suitable for the intended application and comply with the state- of-the-art.

The steel grades of this series offer excellent cold-forming properties. Cold- bordering, cold-flanging, coldbending and cod-folding are possible.

S460ML high yield structural plates are intended for welded and bolted structural applications.

These plates are thermo mechanically rolled weldable fine grained steels.

Applicable codes and standards

BS-EN 10225-4:2004

Material no : 1.8838

analogic DIN EN10025-4

Tensile strength class C

Hot rolled products of structural steel – Part 4 technical delivery conditions.

Defination of S460ML

S640ML
S = Structural	460 = Minimum Yield Strength in MPa for thickness t ≤ 16mm	Letter M	Letter L
Symbol for structural and indicating that following figures specify the minimum yield strangth in MPa.(MPa=N/mm2)	t ≤ 16mm      460MPa 16 <  t  ≤ 25mm  440MPa 25 <  t  ≤ 40mm  440MPa 40 <  t  ≤ 63mm  430MPa 63<  t  ≤ 80mm   410MPa 80<  t  ≤ 100mm  400MPa 100<  t  ≤ 120mm  385MPa	Indicating the supply condition. M:Thermo mechanical rolling and CVN values s pecified at -20º	Specified minimum charpy V-notch valued at test temperature not lower than -50ºC

S460ML Chemical composition

Product analysis in % (All values are max. unless otherwise stated.)

C	0.18	Cu	0.55	Cr+Mo+Ni+Cu	-
Si	0.60	N	0.025	Nb+V	-
Mn	1.70	Nb	0.050	Nb+V+Ti	-
P	0.025	Ti	0.050	CEV (ⅡW) see formula below	0.45¹
S	0.020	V	0.12	Pcm See formula below	Not specified
Cr	0.30	As	-
Mo	0.20	Sb	-	Bi	-
Ni	0.80	Sn	-	Ca	-
Al2	Min 0.02	Pb	-	B	-

CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15

Pcm = C + (Si/30) + (Mn+Cu+Cr)/20 + (Ni/60) + (Mo/15) + (V/10) + 5(B)

1) ¹For lowest thickness range t ≤ 16mm,

2)  A sulphur content of 0,007% max. can be agreed in the order or all products with a thickness of ≤6 mm intended for railway construction.

3) The minimum value for the Al _total content shall not apply if the steel contains sufficient quantities of nitrogen-fixing elements or when sufficient nitrogen binding are used.

4) Max. carbon equivalent value: CE = C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/5. When the steel is suitable for hot dip galvanizing, CE is raised by 0,20%.

S460ML Mechanical Properties

Thickness t	Yield Reh	Tensile Rm	Reh / Rm	CVN	El
mm	MPa (min)	MPa	-	-50ºC	%
t ≤ 16	460	540-720	Not specified	≥27J Longitudinal	17
16 < t ≤ 25	440
25 < t ≤ 40	440
40 < t ≤ 63	430	530-710
63 < t ≤ 80	410	510-690
80 < t ≤ 100	400	500-680
100 < t ≤ 120	385	490-660

Available options as per section 13 of EN 10025-4

Option	Subject	Remarks
15	Surface	The surface condition does comply with EN 10163-2, class A, sub-class 3. No weld repair allowed
6	Internal soundness	Ultrasonically test in accordance with EN 10160. Ultrasonic testing carried out either prior to, or after the final heat treatment and meets the requirements of EN 10160, class S1/E2
-	Mechanical prop.*	Mechanical tests include the PWHT condition for thicknesses greater than 40 mm
-	Strain ageing*	Strain ageing tests are carried out for thicknesses greater than or equal to 12.5 mm
-	Hardness	Hardness tested according to Vickers
4	Through Thickness Testing	TTP testing for thicknesses ≥15 mm. To meet class Z35 according to EN 10164. Through thickness strengths min 80% of specified minimum tensile strength for specified thickness

*Available upon request

Surface

All surfaces have been 100% visually inspected. The surface condition does comply with

EN 10163 -2, class A, sub-class 3.

NDT

Internal soundness as specified in EN 10025-1. The material shall be sound and free from such internal defects which might preclude

its use for the intended purpose.

Certification and traceability.

All dimensions will be supplied with a 3.2 certificate according to EN 10204, endorsed by recognized and independent inspection agency.

Low stress die-stamping on head and tail of each plate.

Dimensional control

All dimensions will be supplied according to EN 10029, flatness calss N, thickness class A.

Welding

The fine-grain structural steel grades of this series can be perfectly welded both manually and using automatic equipment by means of

all known welding processes,not least due to their reduced carbon content and the low carbon equivalent value.

In general, pre-heating prior to welding is not necessary due to the low tendency to cold-cracking. However, the quality of the weld joint depends

on the welding process, the welding conditions and the selection of the correct  filler metals. Gas welding should not be used.

The welding wires and electrodes approved in this strength category must be used as filler metals.

Basic coated electrodes are recommended for manual welding.

Heat Treatment and Anneal

These fine-grain structural steel grades are not suitable for heat treatment above 580°C. Stress relief annealing(530 – 580°C) is required only if called

for in the regulations or if manufacturing conditions make a reduction of the residual welding stresses appear useful.

The holding time should be between 30 and 60 minutes.