AISI 9840
AISI 9840 properties and heat treatment forged piece, Including AISI 9840 application and specifications, We have all specifications，Including AISI 9840 steel plate, AISI 9840 sheet, AISI 9840 square steel, AISI 9840 flat bar,AISI 9840 round bar,AISI 9840 forgings, we can own production and sales.
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We can produce the AISI 9840 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.
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Chemical composition % of the ladle analysis of grade AISI 9840 and Standards
AISI 9840 steel, 540°C (1000°F) temper, 25 mm (1 in.) round
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 9000 Series steel; Low Alloy Steel; Carbon Steel; Medium Carbon steel
Material Notes: Quenched, 540°C temper, 525°C nitride for 40 hours with 20-30% ammonia dissociation, hardness of 88 HR15N case hardness at 0.635-0.762 mm nitrided case depth
Key Words: UNS G98400, AMS 6342 C, ASTM A274, ASTM A322, ASTM A519, SAE J778, DIN 1.6511, UNI 38 NiCrMo 4, B.S. 816 M 40
| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Density | 7.87 g/cc | 0.284 lb/in³ | field average for steels |
| Mechanical Properties | Metric | English | Comments |
| Hardness, Brinell | 361 | 361 | |
| Hardness, Knoop | 390 | 390 | Converted from Brinell hardness. |
| Hardness, Rockwell B | 100 | 100 | Converted from Brinell hardness. |
| Hardness, Rockwell C | 35 | 35 | core hardness. Quenched, 540°C temper, 525°C nitride for 40 hours with 20-30% ammonia dissociation |
| Hardness, Vickers | 382 | 382 | Converted from Brinell hardness. |
| Tensile Strength, Ultimate | 1240 MPa | 180000 psi | |
| Tensile Strength, Yield | 1105 MPa | 160300 psi | |
| Elongation at Break | 15.0 % | 15.0 % | in 50 mm |
| Modulus of Elasticity | 200 GPa | 29000 ksi | Estimated |
| Bulk Modulus | 140 GPa | 20300 ksi | Typical for steel. |
| Poissons Ratio | 0.290 | 0.290 | Calculated |
| Machinability | 70 % | 70 % | Estimated |
| Shear Modulus | 80.0 GPa | 11600 ksi | Typical for steel |
| Electrical Properties | Metric | English | Comments |
| Electrical Resistivity | 0.0000174 ohm-cm | 0.0000174 ohm-cm | Estimated |
| Thermal Properties | Metric | English | Comments |
| CTE, linear | 11.5 µm/m-°C @Temperature 20.0 °C |
6.39 µin/in-°F @Temperature 68.0 °F |
|
| 12.2 µm/m-°C @Temperature 250 °C |
6.78 µin/in-°F @Temperature 482 °F |
Estimated | |
| 13.9 µm/m-°C @Temperature 500 °C |
7.72 µin/in-°F @Temperature 932 °F |
||
| 14.7 µm/m-°C @Temperature 1000 °C |
8.17 µin/in-°F @Temperature 1830 °F |
||
| Specific Heat Capacity | 0.472 J/g-°C | 0.113 BTU/lb-°F | Estimated |
| Thermal Conductivity | 51.9 W/m-K | 360 BTU-in/hr-ft²-°F | Typical steel |
| Component Elements Properties | Metric | English | Comments |
| Carbon, C | 0.380 - 0.430 % | 0.380 - 0.430 % | |
| Chromium, Cr | 0.700 - 0.900 % | 0.700 - 0.900 % | |
| Iron, Fe | 95.945 - 97.02 % | 95.945 - 97.02 % | As remainder |
| Manganese, Mn | 0.700 - 0.900 % | 0.700 - 0.900 % | |
| Molybdenum, Mo | 0.200 - 0.300 % | 0.200 - 0.300 % | |
| Nickel, Ni | 0.850 - 1.15 % | 0.850 - 1.15 % | |
| Phosphorous, P | <= 0.0350 % | <= 0.0350 % | |
| Silicon, Si | 0.150 - 0.300 % | 0.150 - 0.300 % | |
| Sulfur, S | <= 0.0400 % | <= 0.0400 % | |
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Machining performance
Download AISI 9840 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.