S1214 Bright Carbon Steel Bar

S1214 is a free machining low tensile, low hardenability carbon steel generally supplied in the cold drawn or turned and polished condition, with a typical tensile strength range 370 - 760 Mpa, and Brinell hardness range 105 - 225.Characterised by excellent machinability, moderate weldability, with reasonable strength and ductility.

S1214 due to its very low hardenability is generally used in the as supplied condition. It can however be carburised achieving case hardnesses over Rc 60 with smaller sections, this reducing as section size increases. Core strength will remain low for all sections. It can also be carbonititrided offering some advantages over carburising.
It will not respond satisfactorily to flame or induction hardening due to its low carbon content, nor to nitriding due to a lack of suitable alloying elements.
S1214 was developed primarily as a free machining mild steel and it is used extensively by all industry sectors for parts and components where extensive machining is involved and strength or impact properties are not critical to the application.
Typical applications are: All Lightly Stressed Components and Machinery Parts either in the as supplied condition or carburised as required.
Colour Code Stocked Sizes
Pink (Bar End)

Rounds Metric 4 mm - 150 mm Dia
Imperial 1/4" - 6"Dia
Hexagons 7/16" - 75 mm A/F
Squares 1/4" - 4" A/F
Related Specifications
Australia AS 1443 - 1994 1214
Germany W.Nr 1.0715 9SMn28
Great Britain BS970 - Part 3 - 1991 230M07
BS970 - 1955 EN1A
Japan JIS G 4804 SUM22
USA AISI 1213 and 1215
ASTM A29/A29M - 91 1213 and 1215
SAE 1213 and 1215
UNS G 12130
Chemical Composition
Min. % Max. %
Carbon 0 0.15
Silicon 0 0.10
Manganese 0.80 1.20
Phosphorous 0.04 0.09
Sulphur 0.25 0.35
Typical Mechanical Properties - Cold Drawn and Turned and Polished Condition
Cold Drawn Size mm up to 16mm 17 - 38mm 39 - 63mm Turned & Polished (all sizes)
Tensile Strength Mpa Min 480 430 400 370
Max 760 690 630 520
Yield Strength Mpa Min 350 330 290 230
Max 590 550 500 310
Elongation in 50mm % Min 7 8 9 17
Hardness HB Min 142 120 115 105
Max 225 205 185 155
Heat to 1300 oC maximum, hold until temperature is uniform throughout the section and commence forging.Do not forge below 950 oC

Finished forgings may be air cooled.
Heat Treatment
Heat to 890 oC - 920 oC hold until temperature is uniform throughout the section, and cool in furnace.
Pack, salt or gas carburise at 900 oC - 920 oC, holding for sufficient time to develop the required case depth and carbon content, followed by a suitable refining/hardening and tempering cycle to optimise case and core properties.
Core Refine
Slow cool from carburising temperature and re-heat to 880 oC - 900 oC, hold until temperature is uniform throughout the section and quench as required in oil, water.
Case Hardening
Following core refining, re-heat to 760 oC - 790 oC, hold until temperature is uniform throughout the section and quench in water.Temper immediately while still hand warm.
Tempering - After Carburising, Core Refining and Case Hardening
Re-heat to 120 oC - 230 oC, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section and cool in still air.NB. Tempering will improve the toughness of the case with only slight reduction in case hardness. It will also reduce it's susceptibility to grinding cracks.
Heat to 900 oC - 940 oC hold until temperature is uniform throughout the section, soak for 10 - 15 minutes.Cool in still air.
Stress Relieving
Heat to 500 oC - 700 oC hold until temperature is uniform throughout the section, soak for 1 hour per 25mm of section, and cool in still air.
Notes on Heat Treatment
Heating temperatures, rate of heating, cooling and soaking times will vary due to factors such as work piece size/shape, also furnace type employed, quenching medium and work piece transfer facilities etc.Please consult your heat treater for best results.
S1214 in the bright cold drawn or turned and polished as supplied condition has excellent machinability, all operations such as drilling, milling, reaming, tapping, turning etc. can be carried out satisfactorily as per machine manufacturers recommendations for suitable tool type, feeds and speeds.
S1214 has moderate weldability due to its higher sulphur content which can cause hot shortness and porosity during welding. For this reason welding should be avoided if at all possible except for non-critical applications in which case the following welding procedure may be taken as a guide.NB. Welding in the carburised condition is not recommended.
Welding Procedure
Welding electrodes selected should be suitable for welding sulphurised steels.
Please consult your welding consumables supplier for suitable electrodes etc..A pre-heat or post-heat is not generally required, however pre-heating larger sections at 50 oC can be beneficial as can a post-weld stress relieve if this is possible.
Interlloy believes the information provided is accurate and reliable. However no warranty of accuracy, completeness or reliability is given, nor will any responsibility be taken for errors or omissions.