Zhong Neng Steel Union(Qingdao)Heavy Industry Co.,Ltd
                                                                                                           
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Carbon Steel Strip

China Stock Cold Rolled 65mn Saw Blade Spring Steel Strips for 2b 8K TP304L 316L 904L 304 for sale

Stock Cold Rolled 65mn Saw Blade Spring Steel Strips for 2b 8K TP304L 316L 904L 304

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Polished Finish 1-10000tons Hot Rolled Tempered SAE1070 Steel Coil for General Clips for sale

Polished Finish 1-10000tons Hot Rolled Tempered SAE1070 Steel Coil for General Clips

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Z275 Galvanized Steel Strip Cold Rolled Carbon Steel Strip Customized Specifications for sale

Z275 Galvanized Steel Strip Cold Rolled Carbon Steel Strip Customized Specifications

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Sch80 Ss400 S235jr Q345 Q195 C100 Q195 Band Saw Blade Coated Hot Rolled Black Spring Carbon Steel Strip for sale

Sch80 Ss400 S235jr Q345 Q195 C100 Q195 Band Saw Blade Coated Hot Rolled Black Spring Carbon Steel Strip

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Black Round Edge 65mn Mn65 Carbon Steel Strip Spring Strips with ISO Certification for sale

Black Round Edge 65mn Mn65 Carbon Steel Strip Spring Strips with ISO Certification

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China 65mm Galvanized Steel Strip in Coil for Packing Strap / After-sales Service 1-10000tons for sale

65mm Galvanized Steel Strip in Coil for Packing Strap / After-sales Service 1-10000tons

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China ASTM S235jr SPCC Dx51d DC01 Tt LC Iron Mild Ms Cold Rolled Carbon Steel Strip Coil for sale

ASTM S235jr SPCC Dx51d DC01 Tt LC Iron Mild Ms Cold Rolled Carbon Steel Strip Coil

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Carbon Steel Plate Steel Coil 0.3 0.35 2.0 mm Spring Steel Strips for After-sales Service for sale

Carbon Steel Plate Steel Coil 0.3 0.35 2.0 mm Spring Steel Strips for After-sales Service

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Mill Edge Carbon Steel Strip Steel Straps Tempered Spring Steel for Boiler Plate for sale

Mill Edge Carbon Steel Strip Steel Straps Tempered Spring Steel for Boiler Plate

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China 2B TP304L 316L 904L 304 Blue Steel Strapping Gi Carbon Steel Strip for Customization for sale

2B TP304L 316L 904L 304 Blue Steel Strapping Gi Carbon Steel Strip for Customization

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Hot Rolled 65mn SAE 1065 1070 1075 1080 Ck67 Ck75 C75s Spring Steel Strip with GB Standard for sale

Hot Rolled 65mn SAE 1065 1070 1075 1080 Ck67 Ck75 C75s Spring Steel Strip with GB Standard

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Hot DIP Galvanized Low Carbon Alloy Steel Sheet Coil for Construction Coated 1-10000tons for sale

Hot DIP Galvanized Low Carbon Alloy Steel Sheet Coil for Construction Coated 1-10000tons

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Gi Coil Strip Z100 Galvanized Steel for Temperature and Corrosive Environments for sale

Gi Coil Strip Z100 Galvanized Steel for Temperature and Corrosive Environments

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China SA516gr70 A515 Carbon Steel Coil A283 A242 Ah36 As3678 A131 Metal Straps Spring Steel Strip for sale

SA516gr70 A515 Carbon Steel Coil A283 A242 Ah36 As3678 A131 Metal Straps Spring Steel Strip

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Mill Edge Carbon Steel Coil SA516gr70 A515 A283 A242 Ah36 As3678 A131 Spring Steel Strip for sale

Mill Edge Carbon Steel Coil SA516gr70 A515 A283 A242 Ah36 As3678 A131 Spring Steel Strip

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Q235 DC01DC04 Carbon Steel Coil 4140 St37 Low Carbon Steel Coil Cold Rolled Carbon Steel Sheet Strip Mild Steel Strips High Carbon Spring Steel Strip for sale

Q235 DC01DC04 Carbon Steel Coil 4140 St37 Low Carbon Steel Coil Cold Rolled Carbon Steel Sheet Strip Mild Steel Strips High Carbon Spring Steel Strip

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Full Hard Cold Rolled Carbon Steel Strips/Coils Galvanized Steel Coil ISO Certification for sale

Full Hard Cold Rolled Carbon Steel Strips/Coils Galvanized Steel Coil ISO Certification

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Mill Edge HRC SPHC Hot Rolled Q345 Q195 S335jr Carbon Steel Coils Q235 Q235B Cr Ms for sale

Mill Edge HRC SPHC Hot Rolled Q345 Q195 S335jr Carbon Steel Coils Q235 Q235B Cr Ms

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Carbon Steel Strip 65mn Sk85 50crva C45 C50 C75 Q195 Q215 Q235 Q255 Q275 Q355 Ss400 for sale

Carbon Steel Strip 65mn Sk85 50crva C45 C50 C75 Q195 Q215 Q235 Q255 Q275 Q355 Ss400

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7

China Technique Hot Rolled High Carbon 65mn Cold Rolled Steel Strip with ISO Certification for sale

Technique Hot Rolled High Carbon 65mn Cold Rolled Steel Strip with ISO Certification

Price: Negotiable
MOQ: Negotiable
Delivery Time: Negotiable

ZHONGNENG UNION GRADES COMPARISON FOR SPRING STEEL CHINA GB/T USA ASTM JAPAN JIS GERMANY DIN FRANCE NF BIRTAIN BS ISO KOREA KS TAIWAN CNS 65 1065 SUP2 S65-CSP 60E XC65 060A67 C60E4 70 1070 S70C-CSP 60E XC70 070A72 8458-3 DAB 85 1084 SUP2 SK5-CSP C85E XC85 060A86 8458-2 DH SUP1 SUP3 65Mn 1566 S60C-CSP CK67 080A67 C60E4 55Si2Mn 9255 SUP 6 SUP7 55Si7 55Si7 251H60 55SiCr7 55SiMnVB 60Si2Mn 9260 SUP 6 SUP7 65Si7 65Si7 251H60 61SiCr7 SUP3 SUP6 60Si2MnA 9260 SUP 6 SUP7 65SiMn5 55Cr7