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USA UNS G10780
SAE
Steel Number		 1078
Corresponding Standard SAE J403-2014
Chemical Compositions of SAE Carbon Steels
Brand/Supplier
Japan -> NSSC
-> BAOSTEEL
Classification Carbon Steel
Chemical Element Composition Content (%)
  Component C Mn P S
Flat Rolled Products Minimum Value 0.72 0.3 - -
Maximum Value 0.85 0.6 0.03 0.035
  Component C Mn P S
Long Products Minimum Value 0.72 0.3 - -
Maximum Value 0.85 0.6 0.04 0.05
  Component C Mn P
  Minimum Value 0.72 0.3 -
Maximum Value 0.85 0.6 0.05
  Component C Si Mn P S
  Minimum Value 0.72 0.15 0.3 - -
Maximum Value 0.86 0.3 0.6 0.015 0.025
Mechanical Properties
product form Heat Treatment or Condition
Hardness
HBW
Hot-rolled steel plate (Baosteel) Hot Rolling HV
≤360
Hot-rolled steel plate (Baosteel) Annealing HV
≤180
Hot-rolled steel plate (Baosteel) Water quenching 760~850°C HRC
≥60
Hot-rolled steel plate (Baosteel) Oil quenching 790~880°C HRC
≥58
Approximate Comparison Table Spring Steel
United States Germany France European Standard Russia Sweden United Kingdom
AISI UNS DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST SS14 BS EN/BS
1078 G10780 Ck75 1.1248 C75RR C75S 1.1248 75A 1774 CS80

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