1.2721
2014-10-26 15:01:16 Origin： Remark：0 Click：
Specifications 1.2721 is Chromium-Nickel high tensile tool steel available in round bar, flat bar, plate, and forgings fabricated from Steelmelting (ESR refined), Blooming, Hot forging, Hot rolling, Heat treatment, Cold machined.
MATERIAL STANDARDS DATASHEET - Grade W-Nr 1.2721
MATERIAL SPECIFICATIONS - EN ISO 4957: 2000 , DIN 17350 (1980)
CHEMICAL COMPOSITION (mass weight %)
Carbon, C (％): 0.45 ~ 0.55
Silicon, Si (％): 0.15 ~ 0.35
Manganese, Mn (％): 0.40 ~ 0.60
Phosphorus, P (％)≤: 0.035
Sulfur, S (％)≤: 0.035
Chromium, Cr (％): 0.90 ~ 1.20
Molybdenum, Mo (％): -
Vanadium, V (％): -
Nickel, Ni (％): 3.00 ~ 3.50
Silicon, Si (％): 0.15 ~ 0.35
Manganese, Mn (％): 0.40 ~ 0.60
Phosphorus, P (％)≤: 0.035
Sulfur, S (％)≤: 0.035
Chromium, Cr (％): 0.90 ~ 1.20
Molybdenum, Mo (％): -
Vanadium, V (％): -
Nickel, Ni (％): 3.00 ~ 3.50
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working tenperature /℃: 1050～850
Annealing temperature /℃: 610～650
Hardness after annealing ≤HBW: 250
Annealing temperature /℃: 610～650
Hardness after annealing ≤HBW: 250
Quenching temperature /℃: 840 ~ 870
Cooling medium: oil/air cooling
Common tempering temperature /℃: 160~300
Hardness after tempering at temperature HRC|100℃: 59
Cooling medium: oil/air cooling
Common tempering temperature /℃: 160~300
Hardness after tempering at temperature HRC|100℃: 59
Hardness after tempering at temperature HRC|200℃: 56
Hardness after tempering at temperature HRC|300℃: 52
Hardness after tempering at temperature HRC|400℃: 48
Hardness after tempering at temperature HRC|300℃: 52
Hardness after tempering at temperature HRC|400℃: 48
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 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 - heat treatment / spheroidizing annealing
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.
PROFILE & DIMENSIONS
Round bar / Wire rod (Diameter): 5.5mm to 450mm
Square bar / Flat bar: 3mm to 1000mm
Plate / Sheet steel / Steel strip: 0.1mm to 1000mm
Width: 8mm to 1000mm
Length: random length or based on the customer's special requirement.
Forged steel shape: stepped shafts, other different shapes based on OEM.
TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry. pleased to EMAIL our resident team of qualified production engineers, Email: sales@ccsteels.com
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