MATERIAL CATEGORY: Carburizing structural steel
PRODUCT DEscriptION
Proven performance in long-term service.
Extensive database of long term, high temperature test results.
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.
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
MATERIAL SPECIFICATIONS
DIN EN 10084 (1998), DIN 17210 (1986)
CHEMICAL COMPOSITION (WEIGHT %)
C(％): 0.11～0.17
Si(％): ≤0.40
Mn(％): 0.30～0.60
P(％)≤: 0.035
S(％)≤: 0.035
Cr(％): 0.80～1.10
Mo(％): 0.10～0.25
Ni(％): 3.00～3.50 MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working temperature /℃: 1150～850
Heat treatment temperature /℃| annealing: 650～700
Heat treatment temperature /℃|carburization: 880～980
Heat treatment temperature /℃|quenchingⅠ(center): 840～880
Heat treatment temperature /℃|quenchingⅡ(surface): 780~820,-
Heat treatment temperature /℃|tempering: 150～200HBW≤: 241
|size /mm: φ11
|σb/MPa: 1130~1430
|σs≥/MPa: -
|δ5(％)≥: -
|ψ(％)≥: -
|AKV/J: -|size /mm: φ30
|σb/MPa: 1030~1330
|σs≥/MPa: -
|δ5(％)≥: 10
|ψ(％)≥: -
|AKV/J: -|size /mm: φ63
|σb/MPa: 880~1180
|σs≥/MPa: -
|δ5(％)≥: 11
|ψ(％)≥: -
|AKV/J: - AVAILABLE SHAPES Black bar /Flat bar / Square bar /Pipe, /Steel strip, /sheetBright - peeled + polishing, centerless grindingForged - ring, tube, pipe casing, discs, shaft TYPICAL APPLICATIonSAlloy 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 – fastenersMechanical gears, gear shaft, main axis, valve rodMechanical parts - connecting rod, bolt and nutMultidiameter shaftPressure vessel, seamless pipe
TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry. pleased to EMAIL our resident team of qualified production engineers.
Mr Chen, Mr.Jiang - Email: lh.steel@hotmail.com PRODUCT PROFILE
Round bar / Wire rod (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. Heavy/middle plate via hot rolled: T6 - 200mm X W1000- 2500mm X L1000-12000mm
Sheet steel via cold rolled: T0.5 - 6mm X W600- 1000mm X L1000 - 2000mm
Steel strip via cold rolled: T0.1 - 3mm X W5 - 200mm X L (or in coil form)
Forging piece: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
Pipes / Tubings: OD 3-219 mm, with wall thickness ranging from 0.50 to 35 mm.