1.7779
2015-02-10 09:47:32 Origin： Remark：0 Click：
Description 1.7779 Ex-stock, Suppliers 1.7779 Shaft, Round bar 1.7779 Ring forging, Round Bar, Sheet - steelmaking, ESR, blooming, forging,rolling,heat treatment,straightened, ultrasonic test, cold working,machined. We also possess advanced precision machining equipments for further processing.
Technical standards - DIN SEW 028 (1993), DIN EN 10216-2 (2004) or by agreement.
OFFICIAL TEST CERTIFICATE: issued by TUV - SGS - BV
TECHNICAL DATASHEET - Grade W-Nr 1.7779
MATERIAL CATEGORY: high temperature pressure vessel steel
MATERIAL SPECIFICATIONS: DIN SEW 028 (1993), DIN EN 10216-2 (2004)
CHEMICAL COMPOSITION (Mass weight - %)
C (％): 0.17 ~ 0.23
Si (％): 0.15 ~ 0.35
Mn (％): 0.30 ~ 0.50
P (％)≤: 0.025
S (％)≤: 0.020
Cr (％): 3.00 ~ 3.30
Mo (％): 0.50 ~ 0.60
Si (％): 0.15 ~ 0.35
Mn (％): 0.30 ~ 0.50
P (％)≤: 0.025
S (％)≤: 0.020
Cr (％): 3.00 ~ 3.30
Mo (％): 0.50 ~ 0.60
V (％): 0.45 ~ 0.55
MECHANICAL PROPERTIES - UNDER ROOM TEMPERATURE
Condition: quenched and tempered
Tensile strength, TS σb≥/MPa: 690～830
Yield strength, YS σs≥/MPa: 540
Elongation, EL δ5≥(%): 16.0
Impact, AKV≥/J: 55
Annealed hardness HBS: 220～265
Yield strength, YS σs≥/MPa: 540
Elongation, EL δ5≥(%): 16.0
Impact, AKV≥/J: 55
Annealed hardness HBS: 220～265
HOT WORKING AND HEAT TREATMENT
Hot working temperature /℃: 1100～850
Annealing temperature /℃: 680～730
Quenching temperature /℃: 980～1020
Cooling medium: Oil or Air quenched
Annealing temperature /℃: 680～730
Quenching temperature /℃: 980～1020
Cooling medium: Oil or Air quenched
Tempering temperature /℃: 630～700
AVAILABLE SHAPES
Plate / strip / Round bar / shaft
Bright - milling, polishing, cold machined/finished
Plate / strip / Round bar / shaft
Bright - milling, polishing, cold machined/finished
PRODUCT DESCRIPTION
High room and elevated temperature strength.Good creep.
High notch tolerance.
Thermal expansion coefficients compatible with low alloy steel turbine casing materials.
Lower design and operating risks
Simplified design for bolting configuration compared with martensitic steels or high nickel alloys.
High room and elevated temperature strength.Good creep.
High notch tolerance.
Thermal expansion coefficients compatible with low alloy steel turbine casing materials.
Lower design and operating risks
Simplified design for bolting configuration compared with martensitic steels or high nickel alloys.
Proven performance in long-term service.
Extensive database of long term, high temperature test results.
Extensive database of long term, high temperature test results.
Alloy structural steel is provided with higher yield strength, tensile strength, endurance strength, yield ratio (about 0.85 generally ) enough plasticity and toughness.
The concentration of alloy element of this kind of steel is quite high, mainly are corrosion resistant steel, heat resistant steel, wear resistant steel, and other special steels of physical and chemical properties. Alloy structural steel has preferable mechanical property than that of carbon structural steel, high performance of heat treatment especially.
The alloy is usually produced by EAF /VD /LF 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 in the annealed condition, or bright annealing specially.
Final heat treatment - heat treatment / QT
The concentration of alloy element of this kind of steel is quite high, mainly are corrosion resistant steel, heat resistant steel, wear resistant steel, and other special steels of physical and chemical properties. Alloy structural steel has preferable mechanical property than that of carbon structural steel, high performance of heat treatment especially.
The alloy is usually produced by EAF /VD /LF 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 in the annealed condition, or bright annealing specially.
Final heat treatment - heat treatment / QT
TYPICAL APPLICATIONS
Alloy structural steels are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on.
Power generation – turbine fasteners – boiler support rods.
Process plant – fasteners.
Mechanical gears, gear shaft, main axis, valve rod.
Mechanical parts - connecting rod, bolt and nut.
Multidiameter shaft and pressure vessel.
Alloy structural steels are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on.
Power generation – turbine fasteners – boiler support rods.
Process plant – fasteners.
Mechanical gears, gear shaft, main axis, valve rod.
Mechanical parts - connecting rod, bolt and nut.
Multidiameter shaft and pressure vessel.
TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry. pleased to EMAIL (sales@ccsteels.com) our resident team of qualified production engineers.
If you meet further on any technical enquiry. pleased to EMAIL (sales@ccsteels.com) our resident team of qualified production engineers.
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