Product Description:

Tool Steel

1.2311 40CrMnMo7 Tool Steel

1.2311 is a pre hardened high tensile Tool Steel which offers ready machineability in the hardened and tempered condition, therefore does not always require further heat treatment . This eliminates the risks, cost, and waiting time of heat treatment and avoids the associated possibility of distortion or even cracking. Subsequent 1.2311 component modifications can easily be carried out.

Typical Analysis - 1.2311 Tool Steel
C.	Si.	Mn.	Cr.	Mo.
0.40%	0.40%	1.00%	1.20%	0.35%

Forging:
Heat slowly and uniformly to 1050°C. Do not forge below 930°C. After forging cool slowly.

Annealing:
1.2311 should always be annealed after forging and before rehardening. Heat uniformly to 770/790°C. Soak well and cool slowly in the furnace.

Hardening:
Heat uniformly to 840/870°C until heated through. Quench in oil.

Tempering:
Heat uniformly the 1.2311 tool thoroughly at the selected tempering temperatures and hold at heat for one hour per 25 millimetre of total thickness.

Tempering °C	100	200	300	400	500	600	700
HRc	51	50	48	46	42	36	28
N/mm²	1730	1670	1570	1480	1330	1140	920

Nitriding:
Moulds machined from pre hardened 1.2311 may be nitrided to give a hard surface which is very resistant to wear and erosion. A nitrided surface also increases the corrosion resistance. The surface hardness after nitriding at a temperature of 525°C in ammonia gas will be approximately 650HV.

Temperature	Time	Approximate Depth of Case
525°C	20 hours	0.30mm
525°C	30 hours	0.35mm
525°C	60 hours	0.50mm

Tufftriding:
Tufftriding at 570°C will give a surface hardness of approximately 700HV. After 2 hours treatment the hard layer will be approximately 0.01mm

Flame & Induction Hardening:
1.2311 may be flame or induction hardened to a hardenss of 50 to 55 HRc. Cooling in air is a preferable option. Smaller pieces may however require forced cooling. Hardening should be immediately followed by tempering.

Hard Chromium Plating:
After hard chromium plating the steel should be tempered for approximately 4 hours at 180°C, in order to avoid hydrogen embrittlement.

Case Hardening:
In order to maintain maximum surface hardness 1.2311 may be case hardened. Before case hardening is carried out the steel should be annealed. To carburise, pack with carburising powder into a cast iron or heat resisting steel box and see that the articles are separated from the sides by at least two inches of carburising powder. Lute the lid with fireclay. Heat to the carburising temperature of 880°C and soak for sufficient time to give the required depth of case. Cool to 800/820°C and quench in oil. Tempering will then be necessary. Reheat to 200/300°C and allow to cool in the air to give a final  surface hardness of Rockwell C55/59

Welding:
Firstly heat to approximately 400 to 500°C. Weld .12311 at approximately 400 to 500°C and stress relieve. Use Chromium-Nickel-Molybdenum alloyed basic electrodes for welding of structural steels. Welding may also be carried out using an austenitic Stainless steel electrode. In this case the stipulated increased working temperature may be modified, but the weld metal has a lower strength than the parent material.

Physical Properties:     1.2311	Temperature:
	20°C	200°C	400°C
Density (Kg/m³)	7800	7750	7700
Coefficient of thermal expansion (per °C from 0°C)	-	12.7 x 10-6	13.6 x 10-6
Thermal conductivity (J/m.s °C)	29.0	29.5	31.0
Specific heat (J/kg °C)	460	-	-
Modulus of elasticity:
Kp/mm²	20 900	20 400	18 900
N/mm²	205 000	200 000	185 000

Machining:
Turning	Rough	Medium	Finish
Carbide Tools	Turning	Turning	Turning
Depth of cut (t) mm	min. 10	2-10	max. 2
Feed (s) mm	mm 1.0	0.3-1.0	max. 0.3
ISO Machining Group	P30-P40	P20-P30	P10
Cutting Speed	40-60	60-100	90-160

Milling:
Carbide Tools &	Rough	Finish
High Speed Steel Tools	Milling	Milling
Depth of cut (t)	min. 2	max.2
Feed (s) mm/tooth	min. 0.2	max. 0.2
ISO Machining Group	P30-P40	P10-P20
	Carbide Tools:
Cutting Speed (v) m/min.	55-85	75-95
	High Speed Steel Tools:
Cutting Speed (v) m/min.	10-20	15-30

Mechanical Properties (at room temperature)   1.2311
Tensile Strength	1000-1068 N/mm²
Yield Stress	861-930 N/mm²
Reduction of Area	45-50%
Elongation	14-17%

 

Special Steel classification：

Stainless steel， Hi-Steel HSLA-80， Mould Steel, Heat resistant steel, Tool Steel, Ball bearing steel, Spring steel, Alloy steel, Construction steel， Die steel.

Product description：

Step Shaft 1.2311 Tube 1.2311 Pie-shaped 1.2311 Ring 1.2311 Module 1.2311 Large valves of the main 1.2311 Other Profiled forgings

Products Introduction:

Specialized and high quality steel.
We have the advantages of equipment, technologies and price.

Specifications

Round bar:
Diameter: 1mm-2000mm

Square bar:
Size： 50mm * 50mm-600mm *600mm

Plate steel/flat bar:
Size：Thickness: 0.1mm-800mm Width: 10mm to 1500mm

Tube/pipe:
Size： OD: 6-219mm  WT： 1-35 mm.

Cold-rolled sheet: Thickness: 2-5mm Width: 1000mm Length: 2000mm

Hot-rolled sheet: Thickness:6-80mm Width: 210-610mm

Length: We can supply any length based on the customer's requirement.

Forging/hot rolling/ extrusion of steel.

Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes

Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement

Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement.

Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.

Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer' s requirement

Excellent service for all kinds of industries, with advantages of technologies, equipment and price.

We serve you with our honesty, integrity, and professionality.