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BM42

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BM42 properties and heat treatment forged piece, Including BM42 application and specifications, We have all specifications,Including BM42 steel plate, BM42 sheet, BM42 square steel, BM42 flat bar,BM42 round bar,BM42 forgings, we can own production and sales.


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Specialized high quality steel

We have the advantages of equipment, technologies and price

forged/hot rolling/ extrusion of steel


We can produce the BM42 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.

Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer's requirementExcellent service for all kinds of industries,with advantages of technologies, equipment and price.

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Chemical composition % of the ladle analysis of grade BM42 and Standards

BS4659 BM42 is a cobalt high speed steel which achieves a high hardness with excellent cutting performance and good toughness. After heat treatment M42 has excellent wear resistance, M42 will achieve a high heat treated hardness of 68 to 70 Rockwell C.

 
TYPICAL ANALYSIS
 
     
C.
Si.
W.
Cr.
V.
Mo.
Co.
1.05%
0.35%
1.50%
3.75%
1..15%
9.50.%
8.00%
 
 
  
Annealing: 
Hardening:
For best results harden M42 in a vacuum or atmosphere furnace, or in a properly rectified salt bath. Pre heat throughly to 820 to 870°C, transfer to the high temperature salt bath or furnace. The exact hardening temperature to use will depend on the type of work being treated, but in general M42 components should be hardened from the range of 1160 to 1180°C in salt, or 1180 to 1190°C in atmosphere or vacuum furnaces. After a short hold at the hardening temperature, quench the M42 component without further soaking into salt at 540 to 595°C or warm oil. If salt quenched allow the M42 component to equalise at the bath temperature and then complete the quench in still air. The maximum temperature of the M42 component before tempering shoud be 65°C. Larger components should not be allowed to remain at room temperature without tempering.
Annealed at 770 to 850°C. Soak thoroughly at this temperature and control furnace cool.  


Tempering: 
M42 components can be tempered between 510 to 595°C. For M42 high speed steel components a minimum tempering temperature of 540°C  is recommended to provide suitable relief to the hardening stresses. Triple tempering is recommended with a minimum of two hours at temperature per cycle. The M42 components should be cooled in still air to room temperature between tempering treatments.
 
Tempering °C
    500
    550
    600
HRc
 70
 67
 63



Machining performance

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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.





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