Stainless steel has the following characteristics that are not rust, acid, high temperature resistant, wear resistant and austenitic general non-magnetic. Stainless steel is one of the high alloys steel that our common use, such as stainless steel cutting tools, stainless steel kitchen utensils, and stainless steel building materials and so on. Stainless steel that we see everyday mostly is the 302, 304 and so on, basically the same steel grade nickel chromium stainless steel and 1-4 Cr13 chromium stainless steel. In our country, the varieties of stainless steel (steel grade) in more than 100, and its elements in the steel grade and content of different, its performance and value are also quite different. Therefore, the identification of the stainless steel must be carefully study, understand steel grade clearly. Only comprehensive test method can correctly identify, here as a stainless steel sheet manufacturers ,we will introduce sensory discrimination method

Sensory identification can't distinguish the specific steel (kind of), only difference basically chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel three categories, the identification method is as follows:

The identification of colors and luster: After acid pickling of stainless steel, the surface color is bright and clean, Chromium nickel stainless steel color silvery white jade, Chromium stainless steel color white slightly grey luster weak; the color and luster of chromium manganese nitrogen stainless steel is similar to chromium nickel stainless steel is a bit pale. Without pickling of stainless steel surface color: brown and white chrome-nickel steel, chrome steel, brown and black chromium manganese nitrogen in black. Without annealing cold-rolled stainless steel, chromium nickel surface is reflective.

With magnet for identification: magnets can basic difference between two kinds of stainless steel. Because of the chromium stainless steel in any state can be a magnet to attract; Chromium nickel stainless steel in annealing state is generally no magnetic, after cold working, some become magnetic. But the high manganese content in the high manganese steel is non-magnetic; Chromium nickel nitrogen stainless steel magnetic situation is more complicated: some nonmagnetic, some magnetic, some longitudinal surface nonmagnetic and horizontal surface magnetic. Therefore, magnet can basic difference between nickel chromium and chromium Stainless steel sheet, but can't distinguish between some special steel, more can't distinguish the specific steel grade.

With copper sulfate to identify: To remove the oxide layer on the steel, put a drop of water, with copper sulfate, brush, brush after such as, general stainless steel; If change, amaranth, nonmagnetic for high manganese steel, general for the common magnetic steel or low alloy steel.

We know that pure collagen protein powder that can be taken orally,but we should also know that collagen protein powder is actually a mask can care your face both inside and outside,which can make women more beautiful,the effect of this would be better achieved,so women with that can be more beautiful,let us to introduce some methods to product female mask collagen powder.

Ingredients: milk,honey,collagen powder,an egg

Practice:

1,the egg + milk + a little honey ( if it is dry skin can add more honey ) about 0.5g amount of collagen plus,stir

2,In the face with a brush,wash off after 15-20 minutes . Then coated with moisturizing products,you will see good results.

Precautions before deposition mask,face first with hot wet towel for 3 minutes,to enhance the effect of attaining ; After removing the mask should be cold towel for a moment to make pores . Finally,apply moisturizing skin care products.

Whitening facial mask can do it? What specific approach is it? After the above description,I think a lot of people should know that,At last,I wishes every women to be more younger and beautiful .

Women for their skin requirement is very large,but it was found that women may be some problems in daily dry skin, after investigation we found that collagen can women have a more beautiful skin,but also to enable women to delay aging,so many women are taking,but for pure collagen peptide has a role in what many people do not understand that we were speaking what effect of pure collagen ?

1. Moisture : collagen -rich hydrophilic moisturizing factor,able to lock in moisture conservation skin,has a good moisturizing effect, reducing the amount of oil secretion and maintain skin hydration .

2. Wrinkle : collagen and excellent skin compatibility,can be fully absorbed,the matrix is filled in between the skin layer and plump skin,wrinkles, stretch, improve skin density,resulting tension and increase flexibility.

3. repair : repair of collagen has a unique function,collagen and surrounding tissue affinity is good, with repair tissue.

4. gives skin elasticity : Collagen makes skin plump and elastic, lubrication cuticle,stimulate skin microcirculation, promote metabolism,so that structural relaxation of the skin becomes tight,smooth and glossy. Such as wrinkle,remove dark circles,eye bags and so on.

5. nourish the skin : to maintain the integrity of the stratum corneum water and fiber structure,improve the living environment of skin cells and promote skin metabolism, increase blood circulation, achieve the purpose of nourishing the skin.

6. Blemish : sleeping at night when skin cells quickly freshmen and metabolism, dual directional collagen supplement can reach the skin collagen substrate layer,effectively prevent pigmentation, inhibit the formation of melanin, fade pigmentation,collagen products for skin white and delicate,so the time to grasp the new skin collagen and supplementary nutrition is dual directional Blemish necessary condition. What are the pure collagen peptide magical effect? ??After the above description,I think a lot of people should know that, while we should not relax their overtime work all day,the last wish of the young women to be more beautiful .

The shipping cost is calculated based on the size and weight of your parcel. We choose the bigger from the comparing of the actual weight and dimensions weight as the charging weight.Then how to calculate the dimension weight? The formula is length*width*height/5000 against the international practice.Any other query pls view www.fdgloballogistics.com or email summer@feidux.com.

For saving the energy,LED got a lot of promotion,but we need to have a power LED driver,which will directly affect the quality of life of the LED,so it's most inportant thing that how to be an LED driver power supply when you are LED power designer. This article describes some of the LED driver power supplies'problem,and hope to be able to provide a little to help engineers .

1,LED drive circuit directly affect life

We are talking about led drivers include digital and analog drive categories drive,digital drive means driven digital circuits,including digital dimming control,RGB full color changes and so on. Analog driving means driving analog circuits,including AC constant current switching power supply,DC constant current control circuit . Driven by the electronic circuit components,including semiconductor elements,resistors,capacitors,inductors,etc. These components have a service life of any device failure will cause a failure of the whole or part of the circuit is deactivated. LED life is 5-10 million hours,calculated by 50,000 hours,continuous light,nearly six years of life. Switching power supply life is difficult to achieve a six-year,switching power supply warranty period is generally available on the market 2-3 years,up to 6 -year warranty is military power level,the price is 4-6 times the normal power supply,the general lamps Factory is unacceptable . So mostly the fault LED lamp drive circuit malfunction .

2,The heat problem

LED cold light source,operating junction temperature must not exceed the limit,but also left a certain margin design. The lighting is designed to consider the appearance,ease of installation,many aspects of light,heat,etc.,to seek a balance in many factors,so that the overall lighting is the best. Development time is not long LED lamps,can learn the little experience,many designs are constantly improved . Some manufacturers use LED lighting power for the outsourcing or outsourcing,lighting designers know much about the power supply,LED heat to a larger space,the smaller the power of heat to space . Lighting design is generally good and then find a suitable power to support,so give the power to bring some difficulty matching . Often encountered by small lamps inside the interior space or high temperatures,and low cost control,can not be assigned to an appropriate power source. Some LED lighting plant has a power R & D capabilities,at the beginning of the initial lighting design to assess the power of design simultaneously,we can solve the above problems. To be taken into account in the design of the cooling heat and power LED,the overall control of the lamp temperature,so as to design a better lighting .

3,Power supply design problems

a,power design . Although the LED luminous efficiency,but there are 80-85 % of heat loss,causing the lamp inside temperature 20-30 degrees,25 degrees if the ambient temperature conditions,there are 45-55 degrees inside the lamp power for a long time in a hot environment working to ensure that life we must increase the power margin,generally left to 1.5-2 times the margin.

b,component selection . Internal temperature of 45-55 degrees lower lighting conditions,as well as the power supply internal temperature of about 20 degrees,the temperature near the device to reach 65-75 degrees. Some components in high temperature parameter drift,and some life will be shortened,so that the device you want to select,special attention can be used for a long time at a high temperature electrolytic capacitors and wires.

C,the electrical properties of the design . The switching power supply design parameters for the high power led module is mainly constant parameter determines the size of the current brightness of the LED,if the bulk of the current error is large,the brightness of the entire batch of light uniform. And changes in temperature can cause the power supply output current offset . Batch error control is generally within + / -5%,in order to ensure consistent brightness of the lamp . LED forward voltage drop of a deviation,the constant current power supply design voltage range to include LED voltage range. Use multiple LED series,when multiplied by the minimum pressure drop for the lower voltage in series number,series number is multiplied by the maximum pressure drop ceiling voltage,constant current power supply voltage range slightly wider than this range,the general upper and lower limits of each leaving 1-2V margin.