BM42
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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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.
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Chemical composition % of the ladle analysis of grade BM42 and Standards
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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.
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TYPICAL ANALYSIS
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C.
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Si.
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W.
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Cr.
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V.
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Mo.
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Co.
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1.05%
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0.35%
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1.50%
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3.75%
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1..15%
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9.50.%
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8.00%
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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
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550
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600
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HRc
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70
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67
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63
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Machining performance
Download BM42 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.