BS970 Spring Steel Grades

We still get asked for steel grades that were part of the old British Standard BS970 dating from 1955. Whilst these are no longer available, we can supply equivalents to some of the grades.

They are listed below for reference purposes.

If you require a steel grade listed below, contact us for advice on suitable modern equivalents.

 

Grade C Mn Si Cr Ni S P V
EN8 0.35/0.45 0.60/1.00 0.05/0.35 0.06 0.06
EN8D 0.40/0.45 0.70/0.90 0.05/0.35 0.06 0.06
EN9 0.50/0.60 0.50/0.80 0.05/0.35 0.06 0.06
EN42 0.70/0.85 0.55/0.75 0.10/0.40 0.05 0.05
EN42B 0.60/0.70 0.55/0.80 0.35 M 0.05 0.05
EN42C 0.70/0.80 0.55/0.80 0.35 M 0.05 0.05
EN42D 0.80/0.90 0.55/0.80 0.35 M 0.05 0.05
EN42E 0.60/0.75 0.30/0.60 0.35 M 0.05 0.05
EN42F 0.60/0.75 0.60/0.90 0.35 M 0.05 0.05
EN42G 0.75/0.90 0.30/0.60 0.35 M 0.05 0.05
EN42J 0.75/0.90 0.60/0.90 0.35 M 0.05 0.05
EN43 0.45/0.55 0.70/1.00 0.05/0.35 0.06 0.06
EN43B 0.45/0.50 0.70/1.00 0.05/0.35 0.06 0.06
EN43C 0.50/0.55 0.70/1.00 0.05/0.35 0.06 0.06
EN43D 0.60/0.65 0.40/0.60 0.05/0.35 0.06 0.06
EN43E 0.65/0.70 0.70/0.90 0.05/0.35 0.06 0.06
EN43G 0.45/0.60 0.30/0.60 0.35 M 0.05 0.05
EN43J 0.45/0.60 0.60/0.90 0.35 M 0.05 0.05
EN44 0.90/1.20 0.40/0.70 0.30 M 0.05 0.05
EN44B 0.90/1.20 0.40/0.70 0.35 M 0.05 0.05
EN44C 1.00/1.20 0.40/0.70 0.35 M 0.05 0.05
EN44D 0.90/1.05 0.30/0.70 0.35 M 0.05 0.05
EN44E 1.05/1.25 0.30/0.70 0.35 M 0.05 0.05
EN45 0.55/0.60 0.70/1.00 1.50/2.00 0.05 0.05
EN45A 0.55/0.65 0.70/1.00 1.70/2.00 0.05 0.05
EN47 0.45/0.55 0.50/0.80 0.50 M 0.80/1.20 0.15 min