Constructional steels: Machine building, offshore and valves
Peiron Oy Construction steel
Standard
Alloy symbol
C %
Si %
Mn %
P %
S %
Cr %
Cu %
SFS 365
G-20Mn5
min
max
0.20
0.60
1.5
0.035
0.035
0.30
0.40
SFS 357
G-26-52
min
max
Keskim. 0.25
(0.5)
(0.7)
0.040
0.040
SFS 356
G-23-45
min
max
0.25
(0.5)
(0.7)
0.040
0.040
Guaranteed mechanical characteristics
Standard
The condition of delivery
Yield point Rel min. N/mm²
Tensile strength Rm min. N/mm²
Elongation A5 min %
Reduction of area Z N/mm²
Impact strength kV
Hardness HB
min J
°C
SFS 365
01
04
290
290
490
490
18
18
35
35
(28)
(28)
(-40)
(-40)
140-180
140-180
SFS 357
260
520 – 670
18
25
22
20
(150)
SFS 356
230
450 – 600
22
31
25
20
(130)
Condition of delivery 01 is normalized.
Condition of delivery 04 is tempered to balance.
Figures in brackets are not binding.
Mechanical characteristics will be defined from separate samples or from samples that are cast together. The form of samples is according to SFS 351 and measures according to SFS 3077.
Welding
The welding of SFS-365 requires a 100°C pre-heating. As an ingredient a non-blended or an Mn-blended ingredient is to be used. After welding a heat-treatment of 500-650°C is required. Welding of SFS 357 requires a pre-heating of 200-300°C. After welding SFS 357 requires a tension removing and normalization tempering. SFS 356 can be welded by common welding methods. After large-scale welding a tension removing and normalization tempering is required.
Equivalence of standards
G-20Mn5
Country
Standard
Alloy symbol
Sweden
SIS 14 21 72
SS 21 72
Germany
DIN 17245
GS-C25
USA
ASTM A 352
LCC
Russia
COST 21357-75
20 GLS
G-23-45
Country
Standard
Alloy symbol
Sweden
SIS 14 13 05
SS 13 05
Germany
DIN 1681-1967
GS-45
USA
ASTM A 27
65-35
Russia
COST 977-75
20 L
G-26-52
Country
Standard
Alloy symbol
Sweden
SIS 14 15 05
SS 15 05
Germany
DIN 1681-1967
GS-52
USA
ASTM A 27
70-36
Russia
COST 977-75
35 L
Contacs
PEIRON OY STEEL FOUNDRY P.O. Box 88 FI-32801 Kokemäki FINLAND Tel: +358 20 750 9400 E-mail: info@peiron.com