Stainless steel bar of a chemical identification coup, copper point test method - copper sulfate point test is quick to distinguish between ordinary carbon steel, and the easiest way of all types of stainless steel, copper sulfate solution used in concentrations of 5% -10% before, during the dot test, the test area should be thoroughly remove oil or other contaminants stainless steel, and with a grinding machine Polishing cloth or a small piece of polished stainless steel embossed plate area, and then try to polish droplets at the stainless steel trash can, ordinary carbon steel or iron within a few seconds the surface will form a layer of copper, and stainless steel surface point try not display color copper or copper precipitation generation. 2, sulfuric acid test methods - sulfuric acid immersion 302 and 304 stainless steel can with 316 and 317 to distinguish. Trimming the sample to be finely ground, and then in a volume concentration of 20% to 30%, temperature 60 ~ 66 ℃ sulfuric acid cleaning and passivation of half an hour, the volume concentration of 10% sulfuric acid solution was heated to 71 ℃ when immersed in the solution 302 and 304, has been rapid corrosion of steel and produce large amounts of air bubbles in the sample black within minutes; and 316 and 317 samples of the steel from corrosion or erosion is very slow (no bubbles), test within 10 to 15 minutes does not change color. If the test sample simultaneously with a known composition to approximate comparison, the test can be more accurate. Chongqing Chongqing stainless steel machining difficult reasons consistent processing factories have the same feeling: Stainless difficult to process. In fact, nothing more than the following reasons: 1: Processing hardness resulting in rapid tool wear, and very difficult to chip. 2: The low thermal conductivity caused shavings edge of plastic deformation and rapid tool wear. 3: BUE easily lead to fines emblem pieces left on the cutting edge of the pin, and cause adverse machined surface. 4: chemical relationship between the tool and the workpiece caused by work hardening and low thermal conductivity materials processing, not only likely to cause unusual wear, but will the tool chipping and abnormal rupture. Existing processing problems than solutions as follows: A: Use tools with high thermal conductivity, B: the sharp edges of the cutting edge: chipbreaker with a wide blade of stainless steel products, can reduce the cutting pressure, so that we can better control BTA. C: optimal cutting conditions: inappropriate processing conditions will reduce tool life. D: Select the appropriate tool: stainless steel knives should have a very good toughness, adhesion strength and cutting edge coating films have relatively high. Stainless Steel | Stainless Steel Products Co., Ltd. Yao Yi (certified) | stainless steel supplied by Yao Yi Stainless Steel Products Co., Ltd., Chongqing. Stainless Steel Products Co., Ltd. Chongqing Yi Yao (www.shudumy.com) is Chongqing Municipality, stainless steel and products of leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Yao Yi leader in stainless steel with the staff warmly welcome all inquiries to discuss and create art Yiu stainless steel a better future.