We are professional AISI 4340(34CrNiMo6,SAE 4340) Forged Forging Forge Alloy Steel DTH Hammer Drilling Drill Bits Body Bodies Heads Shank from china
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Applications
This grade of steel is suited for shock loading or stress concentration applications such as shafts, gears, bolts, nuts, pins and couplings.
Forging
Preheat the steel carefully, then raise the temperature to 1150-1210°C for forging. Do not forge below 850°C. 4340 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.
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.
Stress Relieving
When components are heavily machined, ground or otherwise subject to cold work, stress relieving will be beneficial prior to hardening.
Hardening
4340 steel is usually supplied ready heat treated. If further heat treatment is required annealed 4340 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.
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.
Heat Treatment
Heat treatment temperatures, such as rate of heating, cooling and soaking times can vary due to factors such as the shape and size of each steel component. Other considerations during the heat treatment of 4340 include the type of furnace, quenching medium and work piece transfer facilities. Please consult a heat treatment specialist for full guidance on heat treatment.
Product Flow
1.Inquiry with drawings in details.
2.Confirm steel material, chemical compositions, mechanical properties, tolerance.
3.Confirm payment terms,order materials or check material in stock.
4.Check material chemical compositions, material weight, dimensions.
5.Cut materials record weight, making mould for casting of pr-hearting for forging.
6.Forging ratios, heat treatment ,dimension check.
7.Rough machining, UT test,heat treatment.
8.Semi-finish, quenching,
8.Fine machining, UT test, dimension inspection, mechanical properties test.
9.Customer inspection, packing, delivery arrangement.
Steel ingot making
EAF+LF+VD/VAD or ESR
Manufacturing process
EAF + LF + VD+ Forging+ Normalizing & Tempering + Rough machining + UT test + Quenching & Tempering + Precision machining
Report
Chemical composition report, Physical properties report, Heat treatment report, Dimensional inspection report, NDT report
Nondestructive test (NDT)
UT ( ultrasonic testing ), MT ( magnetic particle testing ), PT ( penetrant testing)
Quality certification : ISO 9001: 2008, IQNET
Forged ratio: | no less than 4:1
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Technical Data: | According to the customer's requirement of Chemical Composition, Physical Properties and Mechanical Testing |
Test: | Ultrasonic test according to SEP 1921-84 G3 C/c
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Certificate of Quality | in addition the normal terms, production process, the mechanical property forged ratio, UT test result, Grain size, heat treatment methods and the sample of is shown on the Certificate of Quality
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Marking: | Grade, heat NO. length will be stamped one each bar with required color
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Payment: | 30% advance by TT; Balance pay before the shipment against shipping documents or irrevocable LC at sight
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Certification:
ISO 9001:2008, PED Certificate,API, TUVRheinland, Bureau Veritas (BV), Lloyd Register (LR), ABS, RINA, Germanischer Lloyd (GL), Korean Register of Shipping (KR), Det Norske Veritas (DNV), Nippon Kaiji Kyokai (NK);
Forging & Heat Trea
Name&Description | Capacity | Quantity |
3600Thydraulic press | Max. single forging in 18T | 1 |
2000T hydraulic press | Max. single forging in 9T | 2 |
800 hydraulic press | Max. single forging in 5T | 1 |
6T electrical hydraulic hammer | Max.single forging in 5T | 1 |
3T electrical hydraulic hammer | Max.single forging in3T | 1 |
Air hammer | Max.single forging from250kg to 1000kg | 7 |
Forging operation machine | Max.singe forging from20T-5T | 7 |
Heat treatment Furance | Max.8000*5000*1500mm | 11 |
CNC driling machine | Max.5000mm | 2 |
Vertical lathe | From 1600 to 5000mm | 60 |
Horizontal lathe | Max.5000mm | 70 |
Band sawing machine | 260-1300mm | 36 |
