Alloy Steel
All
Experiment Ways
Nickel Based Alloy
Steelmaking
Metal Forming
Heat Treatment
Metal Cutting
Surface Treatment
Company Policy
Another Downstream Industry Technology
Carbon Steel
Stainless Steel
Alloy Steel
Springs Industry
Cutting Tool Industry
Tool Steel
High Speed Steel
Drill Tool Industry
Oil and Gas
Boiler Industry
Bearing Industry
Auto Parts Industry
Fasteners Industry

Alloy Steel

WHAT IS CHROMOLY?

WHAT IS CHROMOLYWhat Is Chromoly Steel?Chromoly steel is a type of low alloy steel that gets its name from a combination of the words “chromium” and “molybdenum” – two of the major alloying elements. Chromoly steel is often used when more strength is required than that of mild carbon steel, though it often comes at an increase in cost. Chromoly falls under the the AISI 41xx designations, and it is important to be aware of the different properties and applications of chromoly steel when deciding which material you need. AISI 4130Chromoly steel is actually alloy steel grade 4130. The “30” at the end of the grade number designates that it has approximately 0.30% carbon by weight. The added chromium and molybdenum help to give the steel different properties from its mild steel counterpart, AISI 1030, even though they have the same percentage of carbon. The alloying elements found in AISI 4130 help to increase the strength to a level higher than that of AISI 1030, which can be increased even more using a proper hardening procedure. The added chromium helps to increase the steels hardenability and also the corrosion resistance; although other types of materials with more corrosion resisting properties should be considered if the material is to be used in a corrosive environment. The added molybdenum helps to increase the toughness. Other important benefits of AISI 4130 include the ability to be easily hardened by heat treating or work hardening, and the ability to be case hardened using a process called carburizing. In its annealed state, AISI 4130 has good formability, machinability, and is quite weldable. For thick sections or low heat input welding processes, preheat may be necessary and is almost always a good idea. Common Applications of Chromoly SteelThe applications of Chromoly steels can be found in a variety of industries. They are very commonly used in automotive, bicycle, and heavy equipment parts, the oil and gas industry, metal production and forming equipment, and many other industries. Here are some more specific examples: MoldsPinsBicycle tubingFurnace equipmentCrank shaftsChain linksDrill collarsMachine shaftsConveyorsTie rodsMiscellaneous tooling

What is Alloy Steel?

What is Alloy Steel? An alloy steel is a type of steel alloyed with more than one element (alloying elements) and these are added to increase strength, hardness, wear resistance and toughness. The added alloying elements that are added to the base iron and carbon structure typically total no more than 5% of the alloy steel’s material composition. Alloy Steel AdvantagesWhether your project requires advanced corrosion resistance, machinability, strength, or another quality, there is an alloy steel that provides the features you need. With added heat treatment alloy steels can provide a wide range of beneficial qualities including:Enhanced corrosion resistanceIncreased hardenabilitySuperior strength and hardness High & Low Alloy Steel Differentiating QualitiesA high alloy steel has alloying elements (not including carbon or iron) that make up more than 8% of its composition. These alloys are less common, because most steel only dedicates a few percent to the additional elements. Stainless steel is the most popular high alloy, with at least 10.5% chromium by mass. This ratio gives stainless steel more corrosion resistance, with a coating of chromium oxide to slow down rusting.Meanwhile, low alloy steel is only modified slightly with other elements, which provide subtle advantages in hardenability, strength, and free-machining. By lowering the carbon content to around 0.2%, the low alloy steel will retain its strength and boast improved formability. Common Steel Alloying ElementsWhen it comes to steel, there are many different elements that can be added to the base material, allowing the purchaser to tweak variances until the right alloy is found. Common alloying elements include the following:l Manganese: Used in tandem with small amounts of sulfur and phosphorus, the steel alloy becomes less brittle and easier to hammer.l Chromium: A small percentage (0.5% - 2%) can help to harden the alloy; larger percentages (4% - 18%) have the added effect of preventing corrosion.l Vanadium: With only .15%, this element can boost strength, heat resistance, and overall grain structure. Mixed together with chromium, the steel alloy becomes much harder, but still retains its formability.l Nickel: Up to 5%, this alloying element will improve the steel’s strength. In excess of 12%, it provides impressive corrosion resistance.l Tungsten: Boosts heat resistance, so the melting point is higher. Also improves the structural makeup of the steel. Alloy Steel Shape & Material OptionsWhether you are searching for a steel or stainless steel alloy, there are several material and shape options worth considering.Steel Alloy ShapesBarPipeTubeSheet & PlateStructural ShapesPre-CutsStainless Steel Alloy ShapesBarTubePipeAngleWireSheet & Plate Fushun Metal LTD COFushun Metal is a large special steel manufacturer and supplier. We are metal experts and have been providing quality customer service and products since 1998. At Fushun Metal, we supply a wide range of metals for a variety of applications. Our products/stock includes: cold rolled steel tube, cold drawn steel tube, hollow bar, boiler tube, alloy steel tube, stainless steel tube, nickel alloy pipe,etc  We also can supply move services like heat-treatment(QT, +A, +N, +SR, +BKS), grounded, polished, cutting, beveled, painted, threaded, upsetting, boring, honing etc. Send your inquiry information to us and get a free quotation today!  

The Uses of DOM and 4130

The Uses of DOM and 4130 When beginning a project, it’s important to select the right type of metal tubing. If you are looking for a flexible metal, you may decide to use DOM tubing. But if you need strength, 4130-grade alloy may be the more reliable option. By understanding the difference between DOM tubing and 4130-grade alloy, you will be able to make the right decision for you. What is DOM?Drawn-over-mandrel (DOM) tubing is a process in which a steel tube is fed through a die and over a mandrel to produce a fine-cut, uniform product. The mandrel smooths the inner surface while stretching the steel, and the die shapes the outer surface. The resulting tube shows off a seamless weld, along with dimensional precision and a phenomenal surface finish. Uses of DOMDOM tubing is superior to a traditional weld. That's why it's the go-to process for projects that require high pressure or large workloads. It's common in heavy-metal industries, such as auto, oil and gas, and aerospace engineering.  This metal practice is generally used to create integral machine parts. Its output of strength and sturdiness stands out in motorcycle frames, mechanical bearings, and hydraulic cylinders. If you want a surefire way to secure an essential part, DOM tubing is your best source. What is 4130 Chromoly?4130 is an alloy steel grade known as Chromoly. Chromoly is a combination of the words "chromium" and "molybdenum." Both are imperative to steel alloying; chromium adds strength and toughness to the element, and molybdenum adds corrosion resistance and can endure extreme temperatures. Chromoly steel possesses enhanced strength and hardness. As an alloy, it helps give steel different properties that can be controlled and refined. Furthermore, Chromoly 4130 is a step up from grade 1030, which is considered mild steel.  Compared to other alloys, Chromoly rates high in corrosion resistance and power. It is heavier than aluminum alloys, though its strength to weight ratio lends itself to metal plans of considerable size and pressure. Uses of 4130 Chromoly Round Tube4130 is used in an array of components that keep major machinery intact. It's applied to high-torque equipment such as crankshafts and heavy-duty equipment such as conveyors. Mechanics often choose to work with 4130-grade steel, using it for roll cages, gears, and race car parts. Rifle barrels and gas delivery tubing sometimes include it as well. Other uses of 4130 include the following:MoldsDrill Collars Bicycle TubingPinsMachine ShaftsTrophy Truck FramesTie Rods Where to Find DOM and 4130 TubingSee for yourself what DOM and 4130 tubing looks like and work it into your design. You can find both at Fushun Metal. The product specifications are available online to help you narrow your search. After assessing whether DOM or 4130 works best for your needs, you can get to work.

Metal materials and process properties

Metal materials are usually classified into ferrous metals, non-ferrous metals, and specialty metallic materials.(1) Ferrous metals, also known as steel materials, include industrial pure iron containing more than 90% of iron, 2% to 4% of carbon containing carbon, carbon steel containing less than 2% carbon, and structural steel and stainless steel for various purposes. Heat resistant steel, high temperature alloy, stainless steel, precision alloy, etc. The broad ferrous metals also include chromium, manganese and their alloys.(2) Non-ferrous metals refer to all metals and their alloys other than iron, chromium and manganese. They are usually classified into light metals, heavy metals, precious metals, semi-metals, rare metals and rare earth metals. Non-ferrous alloys generally have higher strength and hardness than pure metals, and have large electrical resistance and low temperature coefficient of resistance.(3) Special metal materials include structural metal materials and functional metal materials for different purposes. Among them are amorphous metal materials obtained by rapid condensation process, as well as quasi-crystal, microcrystalline, nanocrystalline metal materials, etc.; and special functional alloys such as stealth, hydrogen, superconductivity, shape memory, wear resistance, vibration damping and the like. And metal matrix composite materials.Generally divided into two categories of process performance and performance. The so-called process performance refers to the performance of metal materials under the specified cold and hot processing conditions during the manufacturing process. The technical performance of metal materials determines its adaptability to processing during the manufacturing process. Due to different processing conditions, the required process properties are different, such as casting properties, weldability, forgeability, heat treatment properties, machinability, etc.1, welding performanceRefers to the ability of the welded metal to obtain high quality welds under normal welding process conditions. For carbon steel and low alloy steel, the welding performance is mainly related to the chemical composition of the metal material, wherein the carbon has the greatest influence, and the higher the carbon content, the worse the weldability. For example, low carbon steel has good welding performance, and high carbon steel and cast iron have poor welding performance.2, forging performanceThe ease with which a metal material is formed by a forging process is called forging performance. Its merits and demerits depend on the plasticity and deformation resistance of the metal material. When the metal with good plasticity is deformed, it is not easy to crack; the metal with low deformation resistance is labor-saving when forging, and the tool and the mold are not easy to wear. For example, carbon steel has better forging performance under heating, and cast iron cannot be forged.3, cutting performanceIt refers to the difficulty of metal cutting. It is generally considered that the metal material is more easily cut when it has a suitable hardness (170 to 230 HBS) and sufficient brittleness. Therefore, gray cast iron has better cutting performance than steel, and general carbon steel has better cutting performance than high alloy steel. Changing the chemical composition of steel and performing proper heat treatment is an important way to improve the cutting performance of steel.4, heat treatment performanceThe heat treatment performance of metal materials is evaluated according to their hardenability, hardenability, grain growth tendency, temper brittleness tendency, etc.5, casting performanceThe ability of a metal material to obtain a good casting using a casting method is called casting performance. Its pros and cons are manifested in the following three aspects:(1) Fluidity Fluidity is the ability of a cast metal to flow itself or to fill a mold during casting. It is mainly affected by metal chemical composition and casting temperature. Metallic liquids with good fluidity can cast castings with complete shapes, precise dimensions and clear outlines.(2) Shrinkage It refers to the phenomenon that the volume and size of the molten metal are reduced during the entire cooling process in the mold, which is called shrinkage. The shrinkage of the casting not only affects the size, but also causes defects such as shrinkage, porosity, internal stress, deformation and cracking of the casting. Therefore, the metal used for casting has a smaller shrinkage ratio.(3) Segregation is a phenomenon in which the chemical composition of the liquid metal is not uniform after solidification. When the segregation is severe, the mechanical properties of various parts of the casting can be greatly different, which reduces the quality of the casting.

Difficulties in processing hardened steel

(1) Roughing of hardened steel: In the production process of gears and ring gears that have undergone heat treatment during turning, some gears, ring gears are quenched or carburized and quenched. The hardness is generally above HRC55, and some hardness reaches HRC60 or even HRC65. Some gears have serious deformation after heat treatment, especially the large ring gear and large gear after carburizing and quenching (such as high-speed iron gears, large ring gears for construction machinery, and large gear rings for heavy industry, etc.). These large gear ring gears are deformed after quenching. Very large, this involves hardened steel roughing. (2) Intermittent processing of quenched steel: Indiscriminate cutting has always been a problem, not to mention high-hardness quenched steels with HRC60. Especially when high-speed turning hardened steel, if the workpiece has intermittent cutting, the tool will be subjected to more than 100 impacts per minute to finish processing when intermittently cutting hardened steel, which is a great challenge to the impact resistance of the tool. Taking the processing of automotive gears as an example, it has become a trend to use hardened gears instead of grinding wheels. It is understood that, as one of the three major markets for the gear industry, vehicle gears account for 62% of the total gear market, among which automotive gears also occupy The market share of vehicle gears is 62%. In other words, the gears used in automobiles account for nearly 40% of the entire gear market, showing the importance of gears for the automotive industry. Although hardening and hard turning of hardened steels have been popular, there are still many problems encountered in the processing of automotive hardened gears. For example, some automotive gears have oil holes in their inner holes, and cutters can easily collapse during high-speed operation. Knife, gear position tolerance is difficult to guarantee and so on. (3) Grooving of hardened steels: For example, the hard turning after quenching of synchronizer sleeve engagement grooves, although tool manufacturers have developed special grooved tools for synchronizer sleeves, the tool life is still not satisfactory. (4) The finish of hardened steel turning: If the bearing steel after quenching generally requires a good surface finish, Gcr15 steel is commonly used bearing steel, hardness after quenching is generally around HRC62, in the production and processing of weighing, due to the bearing The precision and finish requirements are very high. If the design is to adjust the cutting edge of the tool, the turning finish can reach Ra0.4 when machining hardened steel with CBN tools.

The processing characteristics of hardened steel

(1) High hardness, high strength, and almost no plasticity: This is the main cutting characteristic of hardened steel. When the hardness of hardened steel reaches HRC50-60, its strength can reach σb=2100~2600MPa. According to the grading rules of the processing property of processed materials, the hardness and strength of hardened steel are all grade 9a, and it belongs to the most difficult cutting material. (2) High cutting force and high cutting temperature: To cut chips from high hardness and high strength workpieces, the unit cutting force can reach 4500 MPa. In order to improve the cutting conditions and increase the heat dissipation area, the tool selects the smaller main and auxiliary angles. This will cause vibration and require a good process system rigidity. (3) It is difficult to generate a built-up edge. Hardened steel has high hardness and brittleness. It is not easy to generate built-up edge when cutting, and the surface to be machined can obtain a low surface roughness. (4) The blade is easy to disintegrate and wear: Due to the brittleness of the hardened steel, the chip and blade contact with each other during cutting is short. The cutting force and cutting heat are concentrated near the cutting edge of the tool, and the blade is easily disintegrated and worn. (5) Low thermal conductivity: The general thermal conductivity of hardened steel is 7.12W/(m·K), which is about 1/7 of that of No. 45 steel. The machinability rating of the material is 9a grade and it is a hard-to-cut material. Due to the low thermal conductivity of the hardened steel, the cutting heat is difficult to carry away through the chips, the cutting temperature is high, and tool wear is accelerated.

What's The Difference Between AISI 4145, AISI 4145H And AISI 4145MOD?

Chromium-Molybdenum high tensile steel has good ductility, shock resistance and wear resistance.AISI 4145, AISI 4145H and AISI 4145MOD are the main type of 4145 Cr-Mo steel. AISI 4145 is a chromium molybdenum low alloy steel grade widely used in the oil and gas sectors but with a higher carbon content compared with AISI 4140. Larger diameters AISI 4145 bars are often supplied with higher Molybdenum level, 0.35% max and may be referred to as a "Drill Collar" analysis. AISI 4145H is the upgraded type of AISI 4145. AISI 4145H has improved hardenability and is commonly used in the high strength condition with min.110 KSI yield and suitable for downhole drilling tools such as subs, x-overs, drill collars, pup-joints and fishing tools. General engineering applications include components exposed to heavy strain, such as shafts, gear, bolts etc. AISI 4145H can also be used in hardened condition as machine parts exposed to heavy wear. AISI 4145MOD is another upgraded type of AISI 4145H. Mod means the modify, that is, the tiny adjustment of chemical constituents of 4145, making steel has better hardenability. Because the inner diameter of many workpieces are less than 200 mm, which need higher performance requirements for the heat treatment, need core performance and meet the requirements, it will need to be improved in order to improve the hardenability. The typical uses of 4145H modified steel are: drilled collars, connecting rods, shafts, gears The tiny difference in chemical composition showed below:MaterialC maxMnCrMoSiNiP maxS max41450.43-0.480.85-1.100.80-1.100.15-0.250.10-0.350.250.0350.044145H0.42-0.490.65-1.100.75-1.200.15-0.250.15-0.300.250.035 0.040 4145H MOD0.42-0.490.65-1.100.80-1.100.15-0.350.15-0.350.250.0250.025 We can see that the difference between them are tiny and most of time they can be replaceable except the Special requirements for workpieces. AISI 4145H are the commonly used type low alloy Cr-Mo steel, more details, contact us mow!

What is 8620 steel material?

8620 gear steel is a low carbon nickel chromium molybdenum alloy steel. And it is a low cost steel with good carburized properties. The nickel content contributes to case toughness at high strength with above average core toughness. The chromium and molybdenum support the proper formation of carbides resulting in good surface hardness and wear. It is used to make a wide range of gears, crankshafts, gear rings, pinions, piston pins, cams, gauges, tie bars, collets, bushings and bolting as well as hand tools and a multitude of machinery parts and components. Structural parts such as gears, pinions, spline shafts, pins and a variety of other important applications requiring a hard wear surface and a ductile core.