BH21 /SKD5
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Technical specifications of BS standards hot work alloy tool steel BH21 /SKD5 datasheet,BS BH21 /SKD5 Chemical compositions,BH21 /SKD5 Mechanical properties from Steelmaking,ESR melted,Blooming, Hot forging, Hot rolling, Heat treatment, Straightening, 100% Ultrasonic test, Cold working, Peeled or rough turned machining. Technical specification - BS 4659/1989. We also possess the advanced precision machining equipments for catering for your different special requirements.
Technical Data Sheet: BH21 /SKD5
OFFICIAL TEST REPORT: issued by TUV - SGS - BV
MATERIAL CATEGORY: Hot work alloy tool steel
MATERIAL SPECIFICATIONS: BS 4659 - 89
CHEMICAL COMPOSITION (WEIGHT - %)
C (％): 0.25~0.35
Si (％): ≤0.40
Mn (％): ≤0.40
P (％)≤: 0.030
S (％)≤: 0.030
Cr (%): 2.25~3.25
Mo (％): ≤0.60
W (%): 8.50~10.0
V (%): ≤0.40
HEAT TREATMENT PRACTICE AND HARDNESS
Annealing temperature ℃: 870~890
Hardness after annealing ≤HBW: 235
Preheating temperature ℃ /: 800
Quenching temperature ℃: 1100~1180
Cooling medium: oil / air cooled
Tempering temperature ℃: 560~675
Hardness value after tempered /≥ HV: -
MELTING PROCESS
This alloy is generally smelt in electric arc furnace (EAF ) or IFF + VD, LF + Electroslag remelting (ESR).
For a purpose of higher quality, it should be smelt via technology of vacuum refining.
TYPICAL APPLICATIONS
Alloy tool steel is widely used to produce the cutting tool, cold/heat distortion mould and measuring implements,
and further to manufacture the piston, valve, valve seat of fuel pump of diesel engine.
Cutlery for medical equipments
Cutting tools
Mechanical parts
Air hammer tools
Piercing tools
HEAT TREATTMENT PRACTICE
The preheating of measuring and cutting tool steel is spheroidizing annealing, final heat treatment is quenching + low temperature tempering and hardness after heat treatment can reach 60~65HRC. When heat treat tool steel grades consideration should be given to hardening temperature, including ratio of heating, cooling and soaking times which will differ due to factors such as the shape and size of each chemical component. Other considerations during heat treatment include the type of furnace, quenching medium and work piece transfer facilities.
PRODUCT PROFILE AND AVAILABLE FORMS
Round bar (Diameter): 0.50mm to 800mm
Square bar / Flat bar: 3mm to 800mm
Length: Fixed length or random length or based on the customer's special requirement.
Steel strip: T0.20 ~ 3mm X W10 ~ 2000mm X Coil
Heavy/middle plate via hot rolled: T4 - 200mm X W1000- 2500mm X L1000-12000mm
Forging piece: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
TECHNICAL SALES ASSISTANCE & SERVICE
If you meet further on any technical enquiry. pleased to EMAIL our resident team of qualified production engineers.
- Email us: lh.steel@hotmail.com
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