Stainless steel grinding instructions

stainless steel 304 csp parts to achieve surface quality and precision requirements, usually grinding methods. Due to the large stainless steel toughness, thermal conductivity, low elastic modulus, so there are problems in the grinding often:

1) easy to adhere to clog the wheel; 2) the machined surface is easy to burn;

3) hardening serious; 4) of the workpiece deformation.

Difficult to see, select and grinding wheel grinding fluid directly affects the efficiency and precision. This paper jam affecting adhesion and surface roughness factors were studied.


2 Experimental conditions and methods

Specimen material selection 1Gr18Ni9Ti, its mechanical properties: σb = 530MPa, σ = 40%, hardness HB = 187 specimen size diameter φ50mm, length 300mm, φ50 cylindrical surface of fine cars, both ends of the plane hit the center hole. Experiments on MGB1420 cylindrical grinder, grinding wheel for P400 × 40 × 203, cylindrical grinding grinding way, in order to improve the reliability of the test results, repeat the test, observe the average effect, eliminate the influence of random factors, while try to keep the grinding conditions are basically the same, by changing the wheel size, hardness, abrasives, grinding fluid replacement, grinding to examine the impact on the amount of grinding effect.


3 experimental results

3.1 wheel size affect adhesion rate

Selection of corundum, hardness K, respectively, for the four wheel size 36,46,60,80 number of specimens were cylindrical grinding, grinding length of 600mm, detection adhesion rate, the finer the grinding wheel, stick attached to the more serious, this is due to the presence of voids between the grains, the grinding chips can be stored in the voids; and finer grinding wheel, voids smaller chip space quickly lose the wheel, causing blockage.


3.2 Effect of the adhesion rate of wheel hardness

Selection of the abrasive is fused aluminum oxide, particle size 46, hardness was H, J, K, L grade wheel, the specimen grinding, grinding stroke 600mm, detection adhesion rate. The higher the hardness of the wheel, the more severe adhesion. This is due to the low hardness of the grinding wheel, abrasive grains in the grinding force, easy to fall off from the wheel surface, the formation of new chip space, easy to plug.


The impact on the adhesion rate of 3.3 abrasive

Commonly used abrasive wheel has two kinds of corundum and silicon carbide green, experiments show that the impact of the two abrasive adhesion rate, the difference is not big, green silicon carbide can reduce the sticking slightly because of the crisp and sharp.


3.4 Effect of the surface roughness of grinding fluid

Respectively, using the three liquid emulsion, an inorganic salt grinding fluid and oil-based grinding fluid, was added sulfur, chlorine and other extreme pressure additives, observed after processing of the workpiece surface roughness, the flow rate of the grinding liquid is 20L / min, the grinding stroke of 600mm, the experimental results shown in Table 3.

As can be seen, the surface tension, containing extreme pressure additives, surface quality obtained by grinding. Rational use of grinding liquid, can improve heat dissipation, the grinding liquid can grinding debris and abrasive shedding flush, while in the metal surface to form a film, a lubricant, reducing surface roughness.


3.5 The amount of influence on adhesion rate of grinding

Workpiece speed, feed rate and grinding depth has little effect on the process, can be seen from Table 2, changing the depth of grinding, has little effect on the adhesion rate.


4. Conclusion

1) Stainless steel factory grinding, reducing wheel adhesion blocking is an important factor to improve grinding efficiency, processing should always trim wheel, keep a sharp cutting edge.

2) stainless steel grinding wheel selection of good self-sharpening wheel is the main objective, generally used in low hardness of the wheel is good, but you can not select the hardness is too low, otherwise the grains did not blunt it off. J recommended use level.

3) To reduce the grinding wheel adhesion obstruction, should be used in coarse-grained wheel. When coarse granularity with the No. 36, 46, when the choice of 60 grit grinding.

4) When the grinding of stainless steel, the use of GC grinding wheel improves the grinding efficiency.

5) grinding fluid selection must take into account the role of lubrication and cleaning of two, adequate supply, the choice of the surface tension, the emulsion containing extreme pressure additives, a high surface quality.

6) Select the amount of grinding allowance can be determined based on.

7) during the experiment found that the wheel organization and binders have some influence on the grinding process of stainless steel, is currently restricted by experimental means, pending further study.

Stainless steel coil used in several major industry

stainless steel coil applications from industry analysts, the automotive industry is currently the fastest growing stainless steel coil applications. Over the past decade, Japanese automakers increased from an average of 10 kg 30 kg with a consumption of stainless steel coil, the United States has more than 40 kg. Bus, subway, high-speed rail cars and other means of public transportation are also widely used stainless steel coil. Chinese home appliance industry is stainless steel coil applications potentially large market. In addition, demand for stainless steel coil in the water industry, building and construction industry, the environmental protection industry, industrial facilities will also be increasing every year.

A vehicle / automobile industry
This is currently the fastest growing stainless steel coil applications. Manufacture of high strength stainless steel coil body structure can greatly reduce vehicle weight, increase strength body structure, made of stainless steel coil panel and decorative parts of the vehicle can reduce maintenance costs. In addition, the stainless steel coil also has the advantage due to corrosion and heat resistance to chloride ions is due to the exhaust system of the vehicle. Now, Japan, the United States, Sweden and other countries have a large number of vehicles using a stainless steel coil. From the 1980s, Japan began to promote, present its stainless steel coil train car reached 60%. Stainless steel coil car industry is the focus of application development.

Second, the water industry
Water contamination in its storage and transportation problems has been growing attention. Large number of proven, stainless steel coils is water preparation, storage, transportation, purification, recycling, desalination and other water industry best selection. Its advantages are: corrosion resistance, earthquake, water, health (no rust and patina), light weight (lighten 1/3), low maintenance, long life (can be used for 40 years), life cycle cost (LCC) low , is recyclable green materials. According to reports, at present, the Tokyo area pipeline has reached 76% of stainless steel coil, pipe leakage rate from 14.7% to 7.5% currently. Osaka, Japan suffered a major earthquake, stainless steel coil storage tank intact. Recently, Japan has developed corrugated pipe fittings, stainless steel coil so that the construction cost is reduced by 20% water pipeline, 3% of the total costs, maintenance costs 3/4.

Third, the construction industry
It is one of the oldest areas of stainless steel coil applications. In architectural terms, at present, mainly used in stainless steel coil high-rise building facades, interior and exterior columns coated, handrails, floor, elevator siding, doors, windows, walls and other internal and external decoration and components. The surface treatment, painting, plating stainless steel coil plate board to solve the problem prone to fingerprints and other touch after making stainless steel coil to further expand the range of applications. Japan has developed a variety of stainless steel coil roofing materials, such as corrosion resistance and better high, medium chromium ferritic and various coating plate. Sweden developed super-clean stainless steel coil plate board surface brushing, France Ugine developed UGITOP surface plate, for the construction industry to provide a new choice.

Fourth, the home appliance industry
In the home appliance industry, a large amount of stainless steel coil is automatic washing machine drum, water heater, microwave oven inside and outside the shell, refrigerator liners, and more use of ferritic stainless steel coil. Western Europe, the proportion of household electric stainless steel coil is large, except in Asia outside Japan closer to the European level tends to be used less. In 1999, the Japanese electronics industry, ferritic, martensitic stainless steel coil consumption reached 28 percent, accounting for 12% of the austenite. China's production of microwave ovens, refrigerators, air conditioners, television and other export products is competitive in the world, the domestic appliance industry is the largest market for stainless steel coil potential applications. It is estimated that the next 5-10 years, China's home appliance industry, stainless steel coil demand will reach 10 million -15 million tons.

Fifth, the environmental protection industry
Industrial waste gas, waste and sewage treatment plant requires the use of stainless steel coil manufacturer. In the flue gas desulfurization process, to resist sulfur dioxide and chlorine ions, iron corrosion in the absorber, coolers, pumps, valves, chimneys, etc. need to use duplex stainless steel coil and high-grade austenitic stainless steel coil . Garbage incinerator, waste water treatment facilities are required high-performance stainless steel coil material.

Six, industrial facilities
Stainless steel coil used in industrial facilities in developed countries the ratio is generally 15% -20%, the proportion of domestic applications small. This is partly due to the introduction of complete sets of industrial equipment, stainless steel coil material are not statistics, on the other hand was not adopted because of domestic materials. Chemical, petrochemical, chemical, paper, food, medicine, energy (nuclear power, thermal power, fuel cells) and other areas of need stainless steel coil. In addition, the existing equipment has been imported into the maintenance period. With the development of the domestic stainless steel coil to improve the quality of products and special grades of products, domestic industrial facilities stainless steel coil applications will increase every year in the future.

overall presentation material stainless steel coils

stainless steel coils at high temperature will creep under long-term extension. Structurally the muffle cover hanging on the roof, in a suspended state, cover the lower part of the water ring seal, is not fixed, allowing a certain amount of creep. Creep accumulated to a certain amount, stainless steel coils remove seal, stainless steel coils with a special plasma cutter to cut away along the lower section of the muffle hood. About half cut once. Cutting operation requires relatively high. Its special equipment, operating space, structure, and operational reliability should pay full attention. stainless steel coils in order to ensure uniform tension strip, plate good, stainless steel sheet coil runs smoothly, equipment installation and high precision. Thus the basis of the amount of differential settlement must be strictly controlled. stainless steel coils needed for routine maintenance and overhaul large height lifting cranes, elevators, fire, forced ventilation and other measures should be supporting in place.

Use the principle of 430 stainless sheet presentation

430 stainless sheet steel is to ask the entire root organizations are uniform in width and length. Bright annealing furnace muffle muffle the use of large size, organization from outside the muffle 430 stainless sheet uniformly heated airflow spiral surrounded by, uniform heating of the strip. And to ensure uniform along the length direction of the strip of tissue, 430 stainless sheet is necessary to maintain the linear velocity of the strip in the furnace constant. So, in front of modern vertical furnaces are equipped with bright heat treatment can be precision adjusted roller tension adjustment device. 430 stainless sheet steel import and export not only make stainless steel factory the heat rate of speed to meet the requirements, not live affect the amount of empty sets or full sets of sets, but also to establish and fine adjustment of the tension strip small strip plate according to circumstances, to meet the board type of request.

409 stainless steel plate used in the process issues

Exhaust gas energy generation, waste heat can also generate electricity, "the heat generated in the production process, we strive to not let it dissipate into the atmosphere, are recycled to generate electricity. We achieve zero purchasing power, is built on a variety of gases, thermal discharge on the basis of scattered above realization. "Not only the production of steel finished iron and steel enterprises, there will be water slag, Stainless steel strips steel slag, sludge, metal, etc. These are called waste. 409 stainless steel plate ready to recycle these wastes, one ton nor outflow achieve zero discarded. Energy conservation, recycling economy so that cost savings, improve efficiency, improve the environment. In personnel optimization projects, the same walk in the front. In the steel industry, the presence of personnel, heavy burden, low per capita labor efficiency and so on. stainless steel sheet suppliers  situation in the steel case, this case was overshadowed by the high profits. 409 stainless steel plate and some alloy elements easily oxidized in the casting process, easy to produce oxide inclusions; In addition, the viscosity of the molten steel is large, it is easy to cause nozzle clogging. Since the solidification morphology of stainless steel is more complex,304 stainless steel plate  poor thermal conductivity of molten steel slab easy to crack, so the cooling and casting speed requirements more stringent, 409 stainless steel plate and take each tundish heating, no oxidation protection casting, electromagnetic stirring , automatic level control and a series of new technologies, greatly improved slab quality, make some hard cast steel.

the overall trend of stainless steel coils

stainless steel coils in the air chemically resistant to the corrosive medium or a high-alloy steel, stainless steel is a beautiful surface and good corrosion resistance, without going through the plated surface treatment, and play inherent in the surface properties of stainless steel, 430、304 stainless steel coil used in wide range of steel, often referred to as stainless steel. stainless steel coils structure has been further optimized, wire rod, rebar, hot-rolled strip steel, cold-rolled sheet, plate, etc. to form a series of generous size, significantly improved the proportion of high value-added products, a substantial increase economic efficiency. At stainless steel sheet coil the national quality supervision departments at all levels of random audits, product quality has always maintained 100% pass rate, not only widely used in large-scale projects of domestic railways, highways, stainless steel coil bridges, subways, etc., also successfully exported to Europe, America, South Korea, Brazil and other countries, have a higher visibility in the overseas markets, stainless steel coils are gradually grow into a modern large-scale iron and steel enterprises.

Development of 430 stainless sheet material and instructions

430 stainless sheet super ferrite stainless steel due to carbon, nitrogen content is very low, compared with ordinary ferritic stainless steel has superior corrosion resistance, 430 stainless sheet  and weldability, nearly half a century has been the strong development and wide application. In the 21st century, put forward the strategy of sustainable development, so that the development of new materials must be environmentally friendly as a prerequisite. 430 stainless sheet organizational performance and quality of ultra-pure ferritic stainless steel has an extremely important role. Stainless steel strips  of studies by super ferrite stainless steel billet quality and performance, and determine niobium, titanium, super ferrite stainless steel in the mode of occurrence and limit the content, as well as niobium, titanium, carbon, nitrogen, the best ratio, 430 stainless sheet steel slab quality problems can optimize the production process and process faced ferrite provide effective solutions. stainless steelp late suppliers , TISCO super ferrite stainless steel production exceeded 100,000 tons, increased by 35% compared to 2011, to create a good economic benefits.

409 stainless steel plate product descriptions and uses

409 stainless steel plate refers to the use of organic polymer materials such as paints, and inorganic materials such as ceramics, metal equipment or parts on the outer layer constituting the maintenance, 409 stainless steel plate the maintenance of the base metal layer can complete isolation and environmental media, to avoid contact with the base metal due to corrosion in stainless steel pieces to form corrosive media. Professional stainless steel stamping hard materials, soft materials, 304 stainless steel plate spring steel, high hardness winding, high-carbon steel, etc; 409 stainless steel plate includes a variety of brand number, hardness level, surface state (BA, 2B, 2D, NO.1 , HL, BF, etc.) or have special requirements for ultra-thin, ultra-flat, super-hard stainless steel strip, plate. The stainless steel plate  is the general taxpayer. 409 stainless steel plate Uses: electronics, computer accessories, IO shrapnel, stationery, kitchen utensils, medical equipment, stainless steel etching materials, chemical packing, auto parts and so on.