40NiCrMo8-4 Steel Round Bar Properties
Type:Round bar
Delivery condition: Annealed black surface/Turned bright surface/Q+T
Products Description
40NiCrMo8-4 steel is used as important quenched and tempered parts requiring good toughness, high strength and large size, such as heavy machinery high load shaft, turbine wheel shaft with diameter greater than 250mm, helicopter rotor shaft, turbine shaft, blade, high load transmission parts of turbojet engine, and crankshaft fastener. Gear, etc; It can also be used for rotor shafts and blades with operating temperature exceeding 400 ℃; It can also be used to manufacture important parts with special performance requirements after nitriding, and can be used as ultra-high strength steel after low-temperature tempering or isothermal quenching.
40NiCrMo8-4 Steel Properties
Elongation δ 5 (%)：≥12
Reduction of area ψ (%)：≥55
Impact energy Akv (J): ≥ 78
Impact toughness value α kv (J/cm2)：≥98(10)
Sample size: sample blank size 25mm
Products parameters
|
Equivalent
Steel Grade
|
AISI | NF | JIS | DIN | BS |
| 4340 | 40NCD3 | SNCM439 | 1.6511 | 816M40 |
40NiCrMo8-4 Chemical Composition
| C | 0.38-0.43% | Cr | 0.70-0.90% |
| Si | 0.15-0.35% | Mo | 0.20-0.30% |
| Mn | 0.60-0.80% | Ni | 1.65-2.00% |
| P | ≤0.025% | S | ≤0.025% |
SIZE RANGE:
Round:
Hot Forged: 80mm-1200mm
Flat:
Hot forged: Thickness: 150-600mm Width: up to 1600mm
SURFACE FINISHES:
Black, Peeled(K12), Cold Drawn, Turned & Polished(H10, H11), Precision Ground(H9, H8)
Test: Ultrasonic test according to SEP 1921-84
Certificate of Quality: issued in English, in addition the normal terms, production process, the mechanical property yield strength, tensile strength, elongation and hardness, forged ratio, UT test result, Grain size, heat treatment methods and the sample of is shown on the Certificate of Quality.
Marking: Heat No. will be cold stamped and Steel grade, diameter mm, length mm, and the manufacturer LOGO and weight kg is painted
Product Picture
Our factory
Steel Making
Ingot Production
Forged Bars
Machinary
40NiCrMo8-4 Alloy Steel Heat Treatment
1) Forging
Preheat the steel carefully, then raise the temperature to 1150-1210°C for forging. Do not forge below 850°C. 40NiCrMo8-4 has good forging characteristics but care must be taken when cooling as the steel shows susceptibility to cracking. Cooling in ash or lime after forging is recommended
2)Annealing
Heat the steel slowly to 800-860°C and allow enough time for the steel to be thoroughly heated. Cool slowly in the furnace.
3)Stress Relieving
When components are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.
4)Hardening
40NiCrMo8-4 steel is usually supplied ready heat treated. If further heat treatment is required annealed 40NiCrMo8-4 should be heated slowly to 830-865°C and after adequate soaking at this temperature quench in oil. Temper as soon as the steel reaches room temperature.
5)Tempering
Heat the steel carefully to a suitable temperature selected by reference to a tempering chart or table, soak at the temperature for 2 hours per 25mm of section, then allow to cool in air.
Packing & Delivery
Packing & Delivery
-
The inner size of container is below:
-- 20ft GP: 5.8m(length) x 2.13m(width) x 2.18m(high)
-- 40ft GP: 11.8m(length) x 2.13m(width) x 2.18m(high)
-- 40ft HG: 11.8m(length) x 2.13m(width) x 2.72m(high)
Our Service
1. Competitive price and quality from our own factory .
2. Best service with 24 hour`s reply .
3. Flexible payment with T/T,L/C , etc .
4. Smooth production ability(1000tons/month).
5. Quick delivery and standard exporting package.
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