In order to meet the stable demand of spring flat bars from foreign customers, our company has been integrated material resources of billet in competitive price and produce in large amount. We have long-time cooperation with domestic steel mills which guaranteed quality and delivery time. Meanwhile, we ourselves are strict on raw material and quality. We usually stock with regular dimensions for meet the customers’ demands on min 1T. At present, the spring flat bars has been widely used on auto fittings, auto manufacturing, hardware tools, chain manufacturing and other machinery manufacturing industry. At present, the dimensions of spring flat bars that our company is able to supply are as follows:
65Mn、60Si2Mn、60Si2MnA、55SiCr、55CrMn、55CrMnA、60CrMnA、50CrV、50CrVA、65F、60C2、60C2A、55XFA、50XΦA、SUP7、S65C-CSP、SAE1566、60C2、SAE9260、SUP9、SAE5155、SUP10、SAE5155、SAE6150、GCr15、SUJ2、SAE52100、ISO100Cr6、En100Cr6、ⅢX15
、C60E4、C60E、61SiCr7、55Cr3、1.7176、51CrV4、1.8159 and so on.
We can supply size as follow:
Spring flat bar steel:Thicknes:5mm-30mm; Wid: 40mm-200mm;
SPRING WIRE: Ф0.9mm-Ф25mm;
ROUND BAR: Ф6mm-Ф250mm;
SPRING PLATE STEEL:Thickness：8mm-40mm; Wide:1250-2000MM。
CROSS PROFILES: Thickness 250 mm
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SPRING FLAT STEEL 
二 Dimension Tolerance:
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|
sectional dimension
（mm）
|
allowable deviation
|
sectional dimension
（mm）
|
allowable deviation
|
sectional dimension
（mm）
|
允许偏差
|
|
|
|
width≤50
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width＞50~60
|
width＞60~70
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|
|
|
Thickness
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6~8
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±0.15
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6~7
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±0.15
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6~7
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±0.18
|
|
|
|
＞8~12
|
±0.18
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＞7~9
|
±0.18
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＞7~12
|
±0.20
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|
|
|
＞12~20
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±0.20
|
＞9~20
|
±0.20
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＞12~20
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±0.25
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|
|
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＞20~30
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±0.20
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＞20~30
|
±0.25
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＞20~30
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±0.30
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|
|
|
＞30
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－
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＞30
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－
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＞30
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±0.30
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|
|
|
Width
|
≤50
|
±0.55
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＞50~60
|
±0.60
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＞60~70
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±0.75
|
|
|
|
|
sectional dimension
（mm）
|
allowable deviation
|
sectional dimension
（mm）
|
allowable deviation
|
sectional dimension
（mm）
|
allowable deviation
|
sectional dimension
（mm）
|
allowable deviation
|
|
width＞70~80
|
width＞80~90
|
width＞90~100
|
width＞100
|
|
Thickness
|
|
|
|
|
|
|
8~10
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±0.20
|
|
7~12
|
±0.20
|
7~12
|
±0.20
|
7~12
|
±0.20
|
＞10~12
|
±0.25
|
|
＞12~20
|
±0.25
|
＞12~20
|
±0.25
|
＞12~20
|
±0.25
|
＞12~20
|
±0.30
|
|
＞20~30
|
±0.30
|
＞20~30
|
±0.30
|
＞20~30
|
±0.30
|
＞20~30
|
±0.35
|
|
＞30
|
±0.35
|
＞30
|
±0.35
|
＞30
|
±0.35
|
＞30
|
±0.40
|
|
Width
|
＞70~80
|
±0.80
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＞80~90
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±0.80
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＞90~100
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±0.80
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＞100
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±1.0
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三 Grade Comparison And Chemical Composition:
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中国GB
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ASTM
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JIS
|
EN
|
C
|
Si
|
Mn
|
Cr
|
V
|
P
|
S
|
HB
|
|
65Mn
|
1566
|
S65C
|
C60E
|
0.62-0.70
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0.17-0.37
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0.90-1.20
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≤0.25
|
|
0.035
|
0.035
|
302
|
|
60Si2Mn
|
9260
|
SUP7
|
61SiCr7
|
0.56-0.64
|
1.50-2.00
|
0.70-1.0
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≤0.35
|
|
0.025
|
0.025
|
321
|
|
60Si2MnA
|
9260
|
SUP7
|
61SiCr7
|
0.56-0.64
|
1.60-2.00
|
0.70-1.0
|
≤0.35
|
|
0.025
|
0.025
|
321
|
|
55CrMnA
|
5155
|
SUP9
|
55Cr3
|
0.52-0.60
|
0.17-0.35
|
0.65-0.95
|
0.65-0.95
|
|
0.025
|
0.025
|
321
|
|
60CrMnA
|
5160
|
SUP9A
|
60Cr3
|
0.56-0.64
|
0.17-0.37
|
0.70-1.00
|
0.70-1.00
|
|
0.025
|
0.025
|
321
|
|
50CrVA
|
6150
|
SUP10
|
51CrV4
|
0.46-0.54
|
0.17-0.37
|
0.50-0.80
|
0.80-1.10
|
0.10-0.20
|
0.025
|
0.025
|
321
|
|
60Si2CrA
|
|
|
54SiCr6
|
0.56-0.64
|
1.40-1.80
|
0.40-0.70
|
0.70-1.00
|
|
0.025
|
0.025
|
321
|
|
28MnSiB
|
|
|
|
0.24-0.32
|
0.60-1.2
|
1.2-1.6
|
B (0.0005-0.0035)
|
0.035
|
0.035
|
|
At the same time, Because the spring steel HRC is too high to hard process. Our company will supply the service of “annealing+straightening”
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