1020 Bright Carbon Steel Bar

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1020 Bright Carbon Steel Bar

1020 is a general purpose low tensile low hardenability carbon steel generally supplied in the cold drawn or turned and polished condition, with a typical tensile strength range 410 - 790 Mpa, and Brinell hardness range 119 - 235.

Characterised by excellent weldability, very good machinability with reasonable strength and very good ductility.

1020 due to its very low hardenability will through harden only in very small sections to relatively moderate strength levels, and is therefore generally used in the cold drawn or turned and polished condition. It can however be carburised achieving case hardnesses over Rc 65 with smaller sections, reducing as section size increases. Core strength will remain as supplied for all sections. Alternatively it can be carbonnitrided offering some advantages over standard 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.

1020 is used extensively by all industry sectors for applications requiring good machinability or excellent weldability when high strength is not required plus lightly stressed carburised parts. It is also often used un-machined as supplied, its bright cold drawn or turned and polished finish being acceptable for many applications.

Typical applications are: Axles, General Engineering Parts and Components, Machinery Parts, Shafts etc. or Carburised: Camshafts, Light Duty Gears, Gudgon Pins, Ratchets, Spindles, Worm Gears etc.

Colour Code

Custard
(Bar End)

Stocked Sizes

Rounds

Metric 5mm - 203.2 mm Dia
Imperial 1/4" - 8"Dia

Squares

Metric 12.7mm - 50.8 mm
Imperial 1/2" - 2"

Bar Finish

Cold Drawn
Turned and Polished

Related Specifications

Australia

AS 1443 - 1994 M1020

Germany

W.Nr 1.0402 C22
W.Nr 1.1151 CK22

Great Britain

BS970 - Part 3 - 1991 070M20
BS970 - 1955 EN3B

Japan

JIS G 4051 S20C

USA

AISI C1020
ASTM A29/A29M - 91 1020
SAE 1020
UNS G 10200

Chemical Composition

Min. %

Max. %

Carbon

0.15

0.25

Silicon

0.35

Manganese

0.30

0.90

Phosphorous

0.05

Sulphur

0.05

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	480 790	380 610	10	142	235
	17 - 38mm	460 710	370 570	12	135	210
	39 - 63mm	430 660	340 480	13	120	195
	Turned & Polished
	All Sizes	410 560	230 330	22	119	170

Forging

Heat to 1100 ^oC - 1200 ^oC maximum, hold until temperature is uniform throughout the section and commence forging.

Do not forge below 900 ^oC

Finished forgings may be air cooled.

Heat Treatment

Annealing

Heat to 870 ^oC - 910 ^oC hold until temperature is uniform throughout the section, and cool in furnace.

Carburising

Pack, salt or gas carburise at 880 ^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 870 ^oC - 900 ^oC, hold until temperature is uniform throughout the section and quench as required in oil, water or brine.

Case Hardening

Following core refining, re-heat to 760 ^oC - 780 ^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 150 ^oC - 200 ^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 suusceptibility to grinding cracks.

Normalizing

Heat to 890 ^oC - 940 ^oC hold until temperature is uniform throughout the section, soak for 10 - 15 minutes and cool in still air.

Stress Relieving

Heat to 650 ^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

1020 in the bright cold drawn or turned and polished as supplied condition has very good machinability and all operations such as turning, drilling, tapping, milling etc. can be carried out satisfactorily as per machine manufacturers recommendations for suitable tool type, feeds and speeds.

Welding

1020 has excellent weldability in the cold drawn or turned and polished as supplied condition, and can be readily welded by any of the standard welding processes.

NB. Welding in the carburised or heat treated condition is not recommended.

Welding Procedure

Low carbon electrodes are recommended.

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 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.