TECHNICAL SPECIFICATION - DIN 17CrNiMo6 & W-Nr 1.6587
Official Test Certificate: issued by TUV - SGS - BV
MATERIAL CATEGORY: Carburizing structural steel
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
DIN EN 10084 (1998), DIN 17210 (1986)
CHEMICAL COMPOSITION (WEIGHT %)
C (％): 0.15 ~ 0.21
Si (％): ≤ 0.40
Mn (％): 0.50 ~ 0.90
P (％)≤: 0.025
S (％)≤: 0.015
Cr (％): 1.50 ~ 1.80
Mo (％): 0.25 ~ 0.35
Ni (％): 1.40 ~ 1.70
Other (％): Al ≤0.05, Cu ≤0.30
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): 830～870
Heat treatment temperature /℃|quenchingⅡ(surface): 780~820, Oil
Heat treatment temperature /℃|tempering: 150～200
|size /mm: φ11
TS, |σb/MPa: 1180~1420
YS, |σs≥/MPa: 835
EL, |δ5(％)≥: 7.0
RA, |ψ(％)≥: 30
Impact, |AKV/J 41
|size /mm: φ30
TS, |σb/MPa: 1080~1330
YS, |σs≥/MPa: 785
EL, |δ5(％)≥: 8.0
RA, |ψ(％)≥: 35.0
Impact, |AKV/J: 41
|size /mm: φ63
TS, |σb/MPa: 980~1270
YS, |σs≥/MPa: 685
EL, |δ5(％)≥: 8.0
RA, |ψ(％)≥: 35.0
Impact, |AKV/J: -
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, bolts and nuts
Pressure vessel, seamless pipe
Round bar / Wire rod (Diameter): 5.5mm 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: T60 - 1000mm X W50 - 1000mm X L1000 - 5000mm
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.
TECHNICAL SALES ASSISTANCE
If you meet further on any technical enquiry, pleased to EMAIL our resident team of qualified production engineers. E-mail: email@example.com