UNS G98400

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 %

Users viewing this material also viewed the following:
AISI 9840 Steel, 595°C (1100°F) temper, 25 mm (1 in.) round
AISI 9840 Steel, 650°C (1200°F) temper, 25 mm (1 in.) round
AISI 4340 Steel, normalized, 13 mm (0.5 in.) round
AISI 4340 Steel, annealed, 25 mm round
AISI 9260 Steel

M984AA / 8711

Production equipment and steel specification, etc
My company can provide more than 350 12 categories, more than 5,000 grades, from the top quality specification group of special steel metal materials.
Smelting equipment: furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode., 0.5 tons - 40 tons), vacuum induction furnace capacity 0.5-10 tons and tons  ESR  0.35 tons - 8 tons.
Pressure: forging maxhine 1200 tons - 8,000 tons, 825 type, type, type of 250 650 mill.
 polishing machine machining: Φ1- Φ 300, Φ sheller Φ 180; 60 - Car light lathe than 12 meters length, diameter, deep drilling than 12 meters length than 12 meters.
Type: ordinary and ingot ingots refining ingot 0.5 tons - 25 tons. Electricity slag remelting ingot 0.35-8 tons and tons of
Size: round bar rolling material Φ 1.0-280. Forging materials Φ 80-600, Φ diameter steel (Φ1 - Φ 235) x (thickness); 0.5-40. Sheet (0.5-12) x 1000 * 2000, Medium thickness plate rolling, forging, width: experiment.it than 610, Alien: fang, flat, ring, canister, steps axis, etc.
Heat: can provide annealing, normalizing, tempering, quenching, aging, piece.modified special requirements such as heat treatment process delivery of products.

Introduction to Our Products:

Specialized high quality steel

We have the advantages of equipment, technologies and price

Forging/hot rolling/ extrusion of steel

Specifications：

Round bar steel: 1mm to 2000mm

Square-shape steel: 10mm  to  1000mm

Plate steel:0.08mm  to  800mm

Width: 10mm to 1500mm

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: φ4-410 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 requirement

Excellent service for all kinds of industries,with advantages of technologies, equipment and price.

We serve you with our honesty, integrity, and professionality.