Product Description

12L14 Steel Grade Equivalent Chart

Country	USA	Germany/UK/France	JAPAN	ISO
Standard	ASTM A29/A29M-05	EN 100087-1998	JIS G4804-2008	ISO 683/9:1988
Grades	12L14	11SMnPb30(1.0718)	SUM24L	11SMnPb28

12L14 Steel Chemical Composition

STAND	C(%)	Mn(%)	P(%)	S(%)	Si(%)	Pb(%)
ASTM A29/A29M-05	≤0.15	0.85-1.15	≤0.04-0.09	0.26-0.35	Max 0.10	0.15-0.35
EN 100087-1998	≤0.14	0.90-1.30	≤0.11	0.27-0.33	≤0.05	0.20-0.35
JIS G4804-2008	≤0.15	0.85-1.15	0.04-0.09	0.26-0.35	≤0.10	0.10-0.35
ISO 683/9:1988	≤0.14	0.90-1.30	≤0.11	0.24-0.33	≤0.05	0.15-0.35

1.0718 Steel Physical Properties

Physical Properties	Metric
Density	7.87 g/cc

12L14 Steel Mechanical Properties

Properties	Metric
Hardness, Brinell	163
Hardness, Knoop	184
Hardness, Rockwell B	84
Hardness, Vickers	170
Tensile Strength, Ultimate	540 MPa
Tensile Strength, Yield	415 MPa
Elongation at Break	10%
Reduction of Area	35%
Modulus of Elasticity	200 GPa
Bulk Modulus	140 GPa
Poisson's Ratio	0.29
Machinability	160%
Shear Modulus	80 GPa

 

12L14 Steel Application

12L14 is used to manufacture tools which have requirements of high precision in size, high finish in surface, but low mechanical property, such as gears, shafts, bolts, valves, bushings, pins, fittings, spring seat and machine screw, plastic mold, surgical and dental procedures utensils, certain automobile parts, instruments, etc. Lead free-cutting steel has low contact fatigue, so it is not suitable for parts such as gears and bearings that are subjected to fatigue stress and load.

 

1.0718 Steel Characteristics

1.12L14 steel can be machined with higher cutting speeds and larger depths of cut.

2.Adding free-cutting elements to get great cutting performance.

3.It is extremely easy to cut on a lathe, increasing tool life and productivity by 40%.

4.Cutting and process are very easy. The processing efficiency gets better than general steel.

 

12L14 Steel Round Bar Sheet Plate Heat Treatment

Annealing

Heat to 890℃ – 920℃ hold until temperature is uniform throughout the section, and cool in furnace.

Carburizing

Pack, salt or gas carburize at 900℃ holding for sufficient time to develop the required case depth and carbon content, followed by a suitable refining/hardening and tempering cycle to optimize case and core properties.

Core Refinea

Slow cool from carburizing temperature and re-heat to 880℃ – 900℃, hold until temperature is uniform throughout the section and quench as required in oil, water.

Case Hardening

Following core refining, re-heat to 760℃ – 790℃, 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 12L14 steel to 120℃ – 230℃, 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℃ – 940℃ hold until temperature is uniform throughout the section, soak for 10 – 15 minutes. Cool in still air.

Stress Relieving

Heat to 500℃ – 700℃ hold until temperature is uniform throughout the section, soak for 1 hour per 25mm of the 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

It is a premium free cutting steel grade suitable for all types of high production and repetition machining.

Welding

12L14 steel is not recommended for welding due to its lead content. It is a health hazard.

 

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