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Also known as wind steel or front steel, also known as white steel. It means that when quenched, it hardens even when cooled in air and is sharp. It is a complex alloy steel containing carbide-forming elements such as tungsten, molybdenum, chromium, vanadium, and cobalt. The total amount of alloying elements is about 10 to 25%. It can still maintain high hardness under high heat generated by high-speed cutting (about 500 ℃), and the HRC can be above 60. This is the most important characteristic of high-speed steel - red hardness. After quenching and low-temperature tempering, carbon tool steel has high hardness at room temperature, but when the temperature is higher than 200 °C, the hardness drops sharply, and the hardness at 500 °C has dropped to a similar level to the annealed state. , completely lost the ability to cut metal, which limits the use of carbon tool steel to make cutting tools. High- speed steel, due to its good red hardness, makes up for the fatal shortcomings of carbon tool steel and can be used to manufacture cutting tools. High-speed steel generally does not do tensile strength testing, but mainly metallographic and hardness testing. After the correct heat treatment of tungsten and molybdenum high-speed steel, the Rockwell hardness can reach above 63, and the cobalt high-speed steel is above 65. The acid leached low-magnification structure of the steel shall not have shrinkage cavities and skin turns visible to the naked eye. The center is loose, and the general looseness should be less than grade 1. The content of metallographic inspection mainly includes three items: decarburization layer, microstructure and carbide inhomogeneity. 1. High-speed steel should not have obvious decarburization. The microstructure must not have fishbone-like eutectic ledeburite. 2. Carbide inhomogeneity in high-speed steel has the greatest impact on quality, and the metallurgical and mechanical departments attach great importance to the level of carbide inhomogeneity. Different grades of carbide non-uniformity requirements can be put forward according to different uses of steel, and usually should be less than grade 3. 3. In addition to high hardness, high wear resistance and sufficient toughness, another important factor is the red hardness of high-speed steel for manufacturing cutting tools. (Red hardness refers to the ability of the cutting edge to resist softening under red heat when the tool is cutting at high speed.) One way to measure the red hardness is to first heat the steel to 580-650°C, keep the temperature for 1 hour, then cool it down, and measure its hardness after repeating this for 4 times. The quenching temperature of high-speed steel is generally close to the melting point of the steel. After quenching, it is generally necessary to temper 3 times between 540 and 560 °C. Increasing the quenching temperature can increase the red hardness of the steel. In order to improve the service life of high-speed steel tools, the surface can be strengthened, such as low-temperature cyanidation, nitriding, sulfur-nitrogen infiltration, etc. songshunmoldsteel41404340

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High-speed steel has good process performance, good strength and toughness, so it is mainly used to manufacture complex thin-edged and impact-resistant metal cutting tools, as well as high-temperature bearings and cold extrusion dies. In addition to the high-speed steel produced by the smelting method, powder metallurgy high-speed steel appeared after the 1960s, which has the advantage of avoiding the reduction of mechanical properties and heat treatment deformation caused by the segregation of carbides produced by the smelting method. The heat treatment process of high-speed steel is more complicated, and it must go through a series of processes such as quenching and tempering. Quenching is generally carried out in two stages due to its poor thermal conductivity. First preheat at 800 ~ 850 ℃ (to avoid causing large thermal stress), then quickly heat to the quenching temperature of 1190 ~ 1290 ℃ (the actual temperature of different brands is different), and then oil cooling or air cooling or gas cooling. The factories are all heated by salt furnaces, and vacuum furnaces are also widely used. After quenching, a part (about 30%) of retained austenite remains in the internal structure and is not transformed into martensite, which affects the performance of high-speed steel. In order to transform the retained austenite and further improve the hardness and wear resistance, it is generally necessary to carry out 2 to 3 tempering times, the tempering temperature is 560 ° C, and the temperature is kept for 1 hour each time. Production method: Usually electric furnace is used for production, and powder metallurgy method was used to produce high-speed steel, so that the carbides are evenly distributed on the substrate in the form of extremely fine particles, which improves the service life. Uses: used in the manufacture of various cutting tools. Such as turning tools, drills, hob, machine saw blades and molds with high requirements. We provide high-quality steel, ex-factory price, support customization, strong company and factory strength; welcome your inquiry and order；please contact us for quotes. MiKi Zhuo E-mail:jacklu@songshunsteel.com Skype/W , hatsapp/Wechat:+86-18269260283 ADD:No.4 Dongda Street, Shatou, Changan Town, Dongguan City, Guangdong Province, P.R.C China Company website: https://steelpurchase.com/ http://w , ww.songshunsteel.com/ songshunmoldsteel41404340 ,

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QEEPO Surface Corona Treatment Treater Machine For Sheet And Plates Material The flat corona machine can solve the problem of weak surface adhesion of many sheet materials. It is easy to install and maintain. The sheet corona machine includes three parts: control cabinet, discharge rack and fan. The control cabinet adopts touch screen design, and the power adjustment and startup operation are simple. Control cabinet parameters Input voltage AC380V 50 / 60Hz Maximum output power 8kw Output voltage 10-15kv Output frequency 15 ~ 25kHz

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Product Features ◆ High directivity, substituting OPT- LI series bar lights for long working distance illumination ◆ Lower power consumption compared to the same size OPT- LI series bar lights ◆ The OPT-LIA14032 bar lights have one channel and 3 colors; the output of green/ blue/ white light source is 24V/3W. ◆ The housing size in length of the OPT-LIA14032 bar lights is 140mm. ◆ The emitting size in length of the OPT-LIA14032 bar lights is 126mm. ◆ The light source OPT-LIA14032 can be used to many applications in automation industry such as metal surface inspection, image scanning and so on. Application Cases ◆ Metal surface inspection ◆ Image scanning ◆ Surface crack detection Model OPT-LIA14032 Color W/B/G Output 24V/3W Channel 1 Housing Size(Length) 140 Emitting Size(Length) 126

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Best Waist Trainer Wholesale Hollow Latex White Best Waist Trainer For Lower Belly Fat MH1923 This hollow latex waist trainer is highly breathable, so it won’t smell bad even when worn in summer. The three rows of hook-and-eye buttons can tighten the waist, shape an hourglass-shaped figure, and facilitate the adjustment of the waist circumference, which can be adjusted to increase or decrease at any time. Product Details Product name Best Waist Trainer Wholesale Hollow Latex White Best Waist Trainer For Lower Belly Fat MH1923 Design By NANBIN Design Team Size 3XS-6XL Thickness Standard Material Latex Color As Shown Weight 0.5kg Crowd Waist trainer for everyday use Brand NANBIN Model Number MH1923

WORLDRACYCLES.COM sells model bicycles : Specialized Mountain Bikes, Specialized Road Bikes, Scott Mountain Bike, Scott Road Bike, Cannondale Mountain Bike, Cannondale Road Bike, Cervelo Mountain Bike, Cervelo Road Bike, Giant Mountain Bike, Giant Road Bike, Trek Mountain Bike, and Trek Road Bike Buy 2022 BMC ROADMACHINE X ONE ROAD BIKE from World Racycles is 100% safe, Because purchase products at World Racycles provide a 100% money back guarantee. Location World Racycles : Jl. Merak No. 48B. Medan. Contact us : order@worldracycles.com, To purchase online visit the website : worldracycles.com Price : USD 3,800.00 Min Order : 1 - 5 Pcs Lead Time : 6 - 9 Days Port : CIF / Kualanamu International Airport Terms : Wise, Bank Transfer, Western union, Moneygram & Xoom Shipment : Worldwide via FedEx, DHL, UPS Product : Ori and Ready in stock 2022 BMC ROADMACHINE X ONE SPECIFICATION FRAME Roadmachine X Premium Carbon with Tuned Compliance Concept Endurance • Internal Cable Routing • PF86 Bottom Bracket • Flat Mount Disc • 12x142mm Thru-Axle FORK Roadmachine X Premium Carbon with Tuned Compliance Concept Endurance • Internal Cable Routing • Flat Mount Disc • 12x100mm Thru-Axle • 50mm Offset (Size 47-51), 45mm Offset (Size 54-61) GEARS 1x12 CHAINWHEEL SRAM FORCE AXS 1 44T CASSETTE SRAM FORCE AXS CHAIN SRAM FORCE 12 Speed REAR DERAILLEUR SRAM FORCE eTap AXS SHIFTERS SRAM FORCE eTap AXS HRD BRAKES SRAM FORCE eTap AXS HRD, Centerline X Rotors (160/160) HANDLEBAR BMC RAB 02, Ergo Top Shape, Compact Bend STEM BMC ICS1 - Integrated Cockpit Design SEATPOST Roadmachine X Premium Carbon D-Shaped Seatpost • 15mm Offset SADDLE Fizik Terra Argo X3 HUBS CRD-321 RIMS CRD-321 Carbon, Tubeless Ready, 35mm TIRES WTB Expanse, 32mm TIRE CLEARANCE 33mm (Measured Width)

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WORLDRACYCLES.COM sells model bicycles : Specialized Mountain Bikes, Specialized Road Bikes, Scott Mountain Bike, Scott Road Bike, Cannondale Mountain Bike, Cannondale Road Bike, Cervelo Mountain Bike, Cervelo Road Bike, Giant Mountain Bike, Giant Road Bike, Trek Mountain Bike, and Trek Road Bike Buy 2022 BMC ROADMACHINE ONE ROAD BIKE from World Racycles is 100% safe, Because purchase products at World Racycles provide a 100% money back guarantee. Location World Racycles : Jl. Merak No. 48B. Medan. Contact us : order@worldracycles.com, To purchase online visit the website : worldracycles.com Price : USD 3,600.00 Min Order : 1 - 5 Pcs Lead Time : 6 - 9 Days Port : CIF / Kualanamu International Airport Terms : Wise, Bank Transfer, Western union, Moneygram & Xoom Shipment : Worldwide via FedEx, DHL, UPS Product : Ori and Ready in stock 2022 BMC ROADMACHINE ONE SPECIFICATION FRAME Roadmachine Premium Carbon with Tuned Compliance Concept Endurance • Internal Cable Routing • PF86 Bottom Bracket • Flat Mount Disc • 12x142mm Thru-Axle FORK Roadmachine Premium Carbon with Tuned Compliance Concept Endurance • Internal Cable Routing • Flat Mount Disc • 12x100mm Thru-Axle • 50mm Offset (Size 47-51), 45mm Offset (Size 54-61) GEARS 2x12 CHAINWHEEL SHIMANO Ultegra 12spd 50-34T CASSETTE SHIMANO Ultegra 12spd 11-34T CHAIN SHIMANO Ultegra 12spd FRONT DERAILLEUR SHIMANO Ultegra Di2 12spd REAR DERAILLEUR SHIMANO Ultegra Di2 12spd SHIFTERS SHIMANO Ultegra Di2 12spd BRAKES SHIMANO Ultegra, RT-MT800 Rotors (160/140) HANDLEBAR BMC RAB 02, Ergo Top Shape, Compact Bend STEM BMC ICS1 - Integrated Cockpit Design SEATPOST Roadmachine Premium Carbon D-Shaped Seatpost • 15mm Offset SADDLE Fizik Taiga HUBS CRD-321 RIMS CRD-321 Carbon, Tubeless Ready, 35mm TIRES VITTORIA RUBINO, 28mm TIRE CLEARANCE 33mm (Measured Width)

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A stud is essentially just a piece of threaded bar. This often resembles a machine screw without a head, although some studs to have heads that get permanently incorporated into the part they are attached to. Studs are often designed to be permanently attached to one part, proving a means of attaching another part in conjunction with a nut. This type of stud may be welded, swaged or bonded to attach it and may, therefore, have a small head to enable this. Other studs may have threads at both ends. In some cases, these are both intended to accept nuts — such a stud is called a stud bolt. Alternatively, a stud may have a self-taping thread at one end, intended to be permanently screwed into a part, and a machine thread at the other end to accept a nut

(1) 1.6511 Alloy Steel Rod Refers To The Corresponding Steel Number China GB steel number 40CrNiMoA, German DIN steel number 36CrNiMo4, German DIN material number 1.6511, French NF standard 40NCD3, Japanese JIS standard SNCM439, British BS standard 816M40, American AISI/ASTM4340, American UNS standard G43400. (2) 1.6511 Alloy Steel Rod Chemical Composition C:0.37-0.44 Si:0.17-0.37 S：≤0.035 P:≤0.035 Mn:0.50-0.80 Cr:0.60-0.90 Mo:0.15-0.25 N:1.25-1.65 (3) 1.6511 Alloy Steel Rod Surface Treatment Plate: Origin Black, Orign cold rolled bright, Machined, Grinded Bar:Origin Black, Orign cold rolled(drawn) bright, Turned, Peeled, Grinded (4) Charateristics 4340 steel offers toughness and high strength inthe heat treated condition, with in roun , d bar 4340 is available fully certified and suitable for applicat , ions  requiring a quality tensile alloy steel.AISI 4340 is commonly supplied quenched and tempered with a hardness of between 24 to 29HRc (5) Contact us Feel free to contact us,we are glad to serve for you. Songshun Always Open the Door for You. MiKi Zhuo Skype/Whatsapp/Wechat:+86-18269260283 A , DD:No.4 Dongda Street, Shatou, Changan Town, Dongguan City, Guangdong Province, P.R.C China songshunmoldsteel41404340

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WORLDRACYCLES.COM sells model bicycles : Specialized Mountain Bikes, Specialized Road Bikes, Scott Mountain Bike, Scott Road Bike, Cannondale Mountain Bike, Cannondale Road Bike, Cervelo Mountain Bike, Cervelo Road Bike, Giant Mountain Bike, Giant Road Bike, Trek Mountain Bike, and Trek Road Bike Buy 2022 BMC ROADMACHINE 01 TWO ROAD BIKE from World Racycles is 100% safe, Because purchase products at World Racycles provide a 100% money back guarantee. Location World Racycles : Jl. Merak No. 48B. Medan. Contact us : order@worldracycles.com, To purchase online visit the website : worldracycles.com Price : USD 7,400.00 Min Order : 1 - 5 Pcs Lead Time : 6 - 9 Days Port : CIF / Kualanamu International Airport Terms : Wise, Bank Transfer, Western union, Moneygram & Xoom Shipment : Worldwide via FedEx, DHL, UPS Product : Ori and Ready in stock 2022 BMC ROADMACHINE 01 TWO SPECIFICATION FRAME Roadmachine 01 Premium Carbon with Tuned Compliance Concept Endurance • ICS Technology, Stealth Cable Routing • PF86 Bottom Bracket • Flat Mount Disc • 12x142mm Thru-Axle FORK Roadmachine 01 Premium Carbon with Tuned Compliance Concept Endurance • ICS Technology, Stealth Cable Routing • Flat Mount Disc • 12x100mm Thru-Axle • 50mm Offset (Size 47-51), 45mm Offset (Size 54-61) GEARS 2x12 CHAINWHEEL SRAM RED AXS 46-33T CASSETTE SRAM RED XG-1290 10-33T CHAIN SRAM RED 12 Speed FRONT DERAILLEUR SRAM RED eTap AXS REAR DERAILLEUR SRAM RED eTap AXS SHIFTERS SRAM RED eTap AXS HRD BRAKES SRAM RED eTap AXS HRD, Centerline XR Rotors (160/160) HANDLEBAR ICS Carbon, One-Piece Full Carbon Cockpit STEM ICS Carbon, One-Piece Full Carbon Cockpit SEATPOST Roadmachine 01 Premium Carbon D-Shaped Seatpost • 15mm Offset SADDLE Fizik Argo Tempo R5 (150mm) HUBS ENVE Alloy Disc RIMS ENVE SES 3.4 AR DISC, 30/40mm TIRES Vittoria Corsa Control, 28mm TIRE CLEARANCE 33mm (Measured Width)

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Description of 4340 chromoly steel:4340 alloy steel is an iron-based alloy containing nickel, chromium and molybdenum. The relatively high carbon content gives this alloy exceptional strength in applications where severe service conditions exist.4340 alloy steel has high strength, good toughness and good ductility. In addition, the alloy is not prone to embrittlement. 4340 steel application: It is used as important quenched and tempered parts that require good toughness, high strength and large size, such as heavy machinery and high-load shafts, turbine shafts with a diameter greater than 250mm, helicopter rotor shafts, turbojet engine turbine shafts, blades, high Loaded transmission parts, crankshaft fasteners. Gears, etc.; can also be used for rotor shafts and blades whose operating temperature exceeds 400 °C; can also be used to manufacture important parts with special performance requirements after nitriding treatment, and can be used for ultra-high temperature after low temperature tempering or austempering. Use of strength steel. 4340 Steel Features:It has high strength, toughness, excellent hardenability and stability against overheating, good plasticity and heat resistance, uniform material, high working reliability, weldability, non-leakage, and simple steel structure production. Short construction period and good assembly. 4140 steel processing technology: Heat treatment standard: quenching at 850℃, oil cooling; tempering at 560℃, water cooling, oil cooling; Metallographic structure: tempered sorbite Heat treatment: 1. Normalizing: Heat the furnace to 900°C~930°C, keep the thickest cross section per inch at this temperature for one hour, and cool in air. 2. Heat to austenitizing at a temperature of 860℃~885℃, and keep the thickest cross section per inch for one hour at this temperature 3. Normalizing or oil quenching, and cooling to a maximum temperature of 121°C 4. Temper at a temperature that achieves the following mechanical properties. The thickest cross-section per inch is held for one hour at the tempering temperature, and the tempering temperature range is 640 ° C ~ 680 ° C 5. For each heat treatment process, a heat treatment chart must be drawn. 6. The mechanical property test shall be carried out in accordance with the stipulations of ASTM. A-370. The sample material used for the test shall be cut from the test bar of the same furnace steel. The casting or forging represented by the sample and the test bar shall be in the same furnace. The test bar shall be heat treated in the same furnace together with the charge. 7. The mechanical properties should meet the following requirements: (Tested with a test bar, sampling according to APT 6A, 110K standard) - Tensile strength minimum lb/inch (862) Yield strength minimum lb/inch 110.000 (758) 2 inches The minimum value of elongation is 15% and the minimum value of section shrinkage rate is %40. Brinell hardness HB285 ~ take, the casting or forging represented by the sample and the test bar must be in the same furnace, and the test bar should be heat treated in the same furnace together with the charge. 8. The mechanical properties should meet the following requirements: (tested with test bars, sampling according to APT 6A, 110K standard) - minimum tensile strength lbs/inch (862) minimum yield strength lbs/inch (758) 2 inches Minimum elongation %15 Minimum shrinkage of section %40 Brinell hardness HB285~352 9. Marking: Each part shall be printed with heat treatment marks and hardness with low stress steel stamp. Company Overview Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc. After more than 10 years development and growing, Songshun Steel becomes one comprehensive special steel factory, stockist and exporter.songshunmoldsteel41404340 ,

Minimum Order: 1 bags