70Si7 / 1.2823
2014-11-08 15:49:12 Origin： Remark：0 Click：
Technical specifications of 70Si7 Cold work tool steel 1.2823 Round bar, Flat bar, Mechanical properties from steelmaking, Hot forging, rolling, heat treatment
TOOL STEEL - DIN 70Si7 & W-Nr 1.2823
MATERIAL CATEGORY: Cold work alloy tool steel
Cold work die includes cold punching mould, wire-drawing die, drawing die, coining die, thread rolling die, cold heading die, cold extrusion die, Based on the working condition, cold work die should have the high hardness, strength, abrasion resistance, toughness, hardenability, quenching degree, and other processing property. This kind of alloy tool steel belongs to high carbon alloy steel (carbon mass fraction is over 0.80%), Chromium is key element of alloy with mass fraction below 5% generally.
MATERIAL SPECIFICATIONS - EN ISO 4957: 2000 , DIN 17350 (1980)
PRODUCT DESCRIPTION
The alloy is usually produced by EAF /VD /LF /IFF followed by electroslag refining (ESR) if necessary for special purpose. Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different level according to the buyers' requirements.
Bars are usually supplied bright (peeling or centreless grinding) in the softened = SA condition.
Final heat treatment - spheroidizing annealing.
CHEMICAL COMPOSITION (mass weight -%)
Carbon, C (％): 0.65 ~ 0.75
Silicon, Si (％): 1.50 ~ 1.80
Manganese, Mn (％): 0.60 ~ 0.80
Phosphorus, P (％) ≤: 0.030
Sulfur, S (％) ≤: 0.030
Chromium, Cr (％): -
Molybdenum, Mo (％): -
Vanadium, V (％): -
Silicon, Si (％): 1.50 ~ 1.80
Manganese, Mn (％): 0.60 ~ 0.80
Phosphorus, P (％) ≤: 0.030
Sulfur, S (％) ≤: 0.030
Chromium, Cr (％): -
Molybdenum, Mo (％): -
Vanadium, V (％): -
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working tenperature /℃: 1100～850
Annealing temperature /℃: 710～740
Hardness after annealing ≤ HBW: 240
Annealing temperature /℃: 710～740
Hardness after annealing ≤ HBW: 240
Quenching temperature /℃: 810~850
Cooling medium: oil
Common tempering temperature /℃: 300~500
Hardness after tempering at temperature HRC | 100℃: 59
Cooling medium: oil
Common tempering temperature /℃: 300~500
Hardness after tempering at temperature HRC | 100℃: 59
Hardness after tempering at temperature HRC | 200℃: 56
Hardness after tempering at temperature HRC | 300℃: 53
Hardness after tempering at temperature HRC | 400℃: 47
Hardness after tempering at temperature HRC | 400℃: 47
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.
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.
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.
Cutting tools
Mechanical parts
Air hammer tools
Piercing tools
TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry. pleased to EMAIL our resident team of qualified production engineers.
PRODUCT PROFILE
Round bar / Wire rod (diameter): 5.50mm to 300mm
Square bar / Flat bar: 3mm to 500mm
Plate / Sheet steel / Steel strip: 0.1mm to 2500mm
Width: 8mm to 1200mm
Length: random length or based on the customer's special requirement.
Forged steel shape: stepped shafts, other different shapes based on OEM.
Pipes / Tubings: OD 3-219 mm, with wall thickness ranging from 0.50 to 35 mm.
