40CrMnMo7
40CrMnMo7 properties and heat treatment forged piece, Including 40CrMnMo7 application and specifications, We have all specifications，Including 40CrMnMo7 steel plate, 40CrMnMo7 sheet, 40CrMnMo7 square steel, 40CrMnMo7 flat bar,40CrMnMo7 round bar,40CrMnMo7 forgings, we can own production and sales.
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We can produce the 40CrMnMo7 has the following specifications:
Round bar steel: 1mm to 3000mm
Square-shape steel: 1mm to 2000mm
Plate steel:0.1mm to 2500mm
Width: 10mm to 2500mm
Lenth: We can supply any lenth based on the customer's requirement.
Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes
Tubings: OD: φ6-219 mm, with wall thickness ranging from 1-35 mm.
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.
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Chemical composition % of the ladle analysis of grade 40CrMnMo7 and Standards
|
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. |
C. Si. Mn. Cr. Mo. 0.40% 0.40% 1.00% 1.20% 0.35%
Typical Analysis - 1.2311 Tool steel
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% |
Machining performance
Download 40CrMnMo7 the mechanical properties of the report, the report provides detailed performance analysis and application. Download >>
Principal Design Features
One of the most widely used precipitation hardening grades in the business. While soft and ductile in the solution annealed condition, it is capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high harness, toughness and strength.
Machinability
Long, gummy chips characterize this alloys machinability. It can be machined in the annealed condition, however condition H1150M will yield best results. Post machining solution treatment of parts will be required prior to final hardening if machining in this condition.
Heat Treatment
CONDITION A--Soak at 1900 F (1038 C) for 30 minutes and cool below 60 F (16 C) for complete martensite transformation. CONDITION H 950- Treat Condition A material at 900 F(482 C) for 1 hour, air cool.. CONDITION H925, H1025, H1075, H1100, H1150- Soak solution treated material for 4 hours at specified temperature, air cool, CONDITION H1150M- Soak solution treated material at 1400 F (760 C) for 2 hours, air cool, then re-heat to 1150 F (620 C) for 4 hours and air cool.
Welding
Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding. AWS E/ER630 filler metal is recommended if required.
Forging
Soak for 1 hour at 2150 F (1177 C) prior to forging. Do not work below 1850 F (1010 C). Post-work solution treatment is required prior to final hardening.