#1, EN9 vs EN19 Steel: Same Standard-BS 970

Both EN9 and EN19 are steel grades in BS 970 standard. BS 970 is one steel specification for wrought steel for mechanical and allied engineering purposes. It specifies requirements for carbon and carbon manganese, alloy, free-cutting and stainless steels normally supplied in the bright cold finished condition. It is only applicable to steels supplied in straight lengths.

en9 vs en19 engineering round steel bar

#2 EN9 vs EN19 Steel: EN9 is carbon steel, while EN19 is alloy steel

EN9 is the old steel number in BS 970-1955 and the corresponding steel grade is 070M55 is BS 970-1991. Below is the chemical composition of EN9/070M55:

Steel Grade C Si Mn P S
EN9/070M55 0.50-0.60 0.10-0.40 0.50-0.90 max 0.05 max 0.05

EN19 is the old steel number in BS 970-1955 and the corresponding steel grade is 708M40 is BS 970-1991. Below is the chemical composition of EN19/708M40:

Steel Grade C Si Mn P S Cr Mo
EN19/708M40 0.36-0.44 0.10-0.40 0.70-1.00 max 0.035 max 0.040 0.90-1.20 0.15-0.25

#3 EN9 vs EN19 Steel: Both are used for engineering steel.

Both EN9 steel and EN19 steel materials, especial round steel bars are used for engineering steel, like gears, shaft, bolt etc.

#4 EN9 vs EN19 Steel: Cost difference

As the chemical composition and mechanical properties difference, EN9 carbon steel will be cheaper than EN19 alloy steel. But it depends on the sizes. For example, large diameter EN9 carbon steel might be more expensive than small diameter EN19 round steel bars. If you have any requests of such materials, you could send to us to request a free quote.

Besides the different chemical composition between EN9 vs EN19, there are mechanical properties difference, tolerance difference, heat treatment difference etc. You could refer to the BS 970 page for more details for mechanical properties difference in EN9 vs EN19 engineering steel.