AISI 8740
AISI 8740 properties and heat treatment forged piece, Including AISI 8740 application and specifications, We have all specifications，Including AISI 8740 steel plate, AISI 8740 sheet, AISI 8740 square steel, AISI 8740 flat bar,AISI 8740 round bar,AISI 8740 forgings, we can own production and sales.
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We can produce the AISI 8740 has the following specifications:
Round bar steel: 1mm to 3000mm
Square-shape steel: 1mm to 2000mm
Plate steel:0.1mm to 2500mm
Width: 10mm to 2500mm
Lenth: We can supply any lenth based on the customer's requirement.
Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes
Tubings: OD: φ6-219 mm, with wall thickness ranging from 1-35 mm.
Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement
Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
Ultrasonic inspection: 100% ultrasonic inspection for any inperfections or based on the customer's requirementExcellent service for all kinds of industries,with advantages of technologies, equipment and price.
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Chemical composition % of the ladle analysis of grade AISI 8740 and Standards
AISI 8740 Alloy Steel
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Designations
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Germany: DIN 1.6546
Italy: UNI 40 NiCrMo 2 KB United Kingdom: B.S. Type 7 United States: AMS 6322 , AMS 6322F , AMS 6323 , AMS 6323D , AMS 6325 , AMS 6325D , AMS 6327 , AMS 6327D , AMS 6358 , AMS 6358B , ASTM A322 , ASTM A331 , ASTM A505 , ASTM A519 , MIL SPEC MIL-S-6049 , SAE J404 , SAE J412 , SAE J770 , UNS G87400 |
Chemical Composition
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Element
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Weight %
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C
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0.38-0.43
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Mn
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0.75-1.00
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P
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0.035 (max)
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S
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0.04 (max)
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Si
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0.15-0.30
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Cr
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0.40-0.60
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Ni
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0.40-0.70
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Mo
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0.20-0.30
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Mechanical Properties
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Properties
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Conditions
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T (°C)
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Treatment
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Density (×1000 kg/m3)
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7.7-8.03
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25
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Poisson's Ratio
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0.27-0.30
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25
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Elastic Modulus (GPa)
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190-210
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25
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Tensile Strength (Mpa)
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695.0
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25
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annealed at 815°C
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Yield Strength (Mpa)
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415.8
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Elongation (%)
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22.2
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Reduction in Area (%)
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46.4
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Hardness (HB)
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201
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25
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annealed at 815°C
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Impact Strength (J)
(Izod) |
40
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25
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annealed at 815°C
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Machining performance
Download AISI 8740 the mechanical properties of the report, the report provides detailed performance analysis and application. Download >>
Principal Design Features
One of the most widely used precipitation hardening grades in the business. While soft and ductile in the solution annealed condition, it is capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high harness, toughness and strength.
Machinability
Long, gummy chips characterize this alloys machinability. It can be machined in the annealed condition, however condition H1150M will yield best results. Post machining solution treatment of parts will be required prior to final hardening if machining in this condition.
Heat Treatment
CONDITION A--Soak at 1900 F (1038 C) for 30 minutes and cool below 60 F (16 C) for complete martensite transformation. CONDITION H 950- Treat Condition A material at 900 F(482 C) for 1 hour, air cool.. CONDITION H925, H1025, H1075, H1100, H1150- Soak solution treated material for 4 hours at specified temperature, air cool, CONDITION H1150M- Soak solution treated material at 1400 F (760 C) for 2 hours, air cool, then re-heat to 1150 F (620 C) for 4 hours and air cool.
Welding
Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding. AWS E/ER630 filler metal is recommended if required.
Forging
Soak for 1 hour at 2150 F (1177 C) prior to forging. Do not work below 1850 F (1010 C). Post-work solution treatment is required prior to final hardening.