S1214 i sa free machining low tensile, low hardenablilty 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 similar 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 components.
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 Stresses Components and Machinery Parts either in the as supplied condition or carburised as required.
COLOUR CODE: Pink - bar end
FORGING: - Heat to 1300degc maximium, hold until temperature is uniform throughout the section and commence forging. Do not forge below 950degc. Finished forgings may be air cooled.
ANNEALING: - Heat to 890 - 920degc, hold until temperature is uniform throughout the section, and cool in furnace
CARBURISING: - Pack, salt or gas carburise at 900-920degc, 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 - 900degc, hold until temperature is uniform throughout the section and quench as required in oil, water.
CASE HARDENING: - Following core refining, re-heat to 760 - 790degc, 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 - 230 degc, hold until temperature is uniform throughout the section, soak for 1 hour per 25mm 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.
NORMALIZING: - Heat to 900 - 940degc hold until temperature is uniform throughout the section, soak for 10-15mins. Cool in still air.
STRESS RELIEVING: - Heat to 500 -700degc 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 transfer for best results.
MACHINING: - S1214 in the bright cold drawn or turned and polished as supplied condition has excellent machinability, by far the best if our range of bright steels and all operations such as drilling, milling, reaming, tapping, tuning etc. can be carried out satisfactorily as per machine manufacturers recommendations for suitable tool types, feeds and speeds.
WELDING: - S1214 has moderate weldability due to its higher sulphur conent 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 sulpurised 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 50degc can be beneficial as can a post-weld stress relieve if this is possible.
Category: MERCHANTS & BRIGHTS