S1214 Bright Carbon Steel Bar

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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

Pink
(Bar End)

Stocked Sizes

Rounds

Metric 6mm - 150 mm Dia
Imperial 5/16" - 6"Dia

Hexagons

5/8" - 75mm

Squares

7.62 mm - 1-1/4"

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

0.15

Silicon

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	Tensile Strength Mpa Min Max	Yield Strength Mpa Min Max	Elongation in 50mm % Min	Hardness HB
	Cold Drawn Size mm	Tensile Strength Mpa Min Max	Yield Strength Mpa Min Max	Elongation in 50mm % Min	Min	Max
	up to 16mm	480 760	350 590	7	142	225
	17 - 38mm	430 690	330 550	8	120	205
	39 - 63mm	400 630	290 500	9	115	185
	Turned & Polished
	All Sizes	370 520	230 310	17	105	155

Forging

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

Annealing

Heat to 890 ^oC - 920 ^oC hold until temperature is uniform throughout the section, and cool in furnace.

Carburising

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.

Normalizing

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.

Machining

S1214 in the bright cold drawn or turned and polished as supplied condition has excellent machinability, by far the best of our range of bright steels and 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.

Welding

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.