Nickel containing low temperature steel in which specification indicates the need for spectroscopic

SH-3501-2011 has written in it and strips, the combination of the two is chromium-molybdenum alloy steel, nickel-containing low-temperature steel, molybdenum austenitic stainless steel, which needs to be spectra, and each batch needs to be sampled 10%, and not less than one piece.

SH3501 stipulates that chromium-molybdenum alloy steel, nickel-containing low-temperature steel, and molybdenum-containing austenitic stainless steel need to be tested for confirmatory materials, 10% per batch, not less than one piece.

GB 50517-2010 Code for construction quality acceptance of petrochemical metal pipeline engineering.

SH 3501-2011 Code for Construction and Acceptance of Petrochemical Toxic and Combustible Medium Steel Pipeline Engineering.

In the "Code for Installation of Pressure Pipelines - Industrial Pipelines Part 4 Production and Installation" GB T requires: spectral analysis should be carried out on nickel-containing low-temperature steel.

The original text is as follows: Alloy steel, nickel-containing low-temperature steel, molybdenum-containing austenitic stainless steel and nickel-based alloy, titanium and titanium alloy material pipe components.

Spectral analysis or other methods should be used to determine the main alloying elements according to the quantity of 5% of each batch (same furnace batch number, same specification, the same below).

and not less than one pipe component.

SH T3501-2011 "Petrochemical Toxic and Combustible Media Steel Pipeline Engineering Construction and Acceptance Code" requirements:

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It can be highly polished and corrosion-resistant, and a dense oxide film can be formed on the surface of humid air at room temperature, which can prevent the metal from continuing to oxidize;

Physical properties: Nickel is a silvery-white metal with magnetism and good plasticity. It has good corrosion resistance, nickel is similar to a silvery-white, hard and malleable metal element with ferromagnetism, it is able to be highly polished and resistant to corrosion.

When dissolved in nitric acid, it is green. It is mainly used in alloys (such as nickel steel and nickel silver) and as a catalyst (such as Ranny nickel, especially as a catalyst for hydrogenation).

Chemical properties: Nickel is insoluble in water, and forms a dense oxide film on the surface of humid air at room temperature, which can prevent the metal from continuing to oxidize. It can be slowly dissolved in dilute acid, releasing hydrogen gas and producing green positive divalent nickel ion Ni; Resistant to strong alkalis.

Nickel can be burned in pure oxygen, emitting a dazzling white light. Similarly, nickel can also be burned in chlorine and fluorine. None of the anti-oxidant solutions, including nitric acid, react.

Nickel is a medium-strength reducing agent. Nickel hydrochloric acid, sulfuric acid, organic acids, and alkaline solutions etch nickel very slowly. Nickel dissolves slowly in dilute nitric acid.

Fuming nitric acid can passivate the surface of nickel and make it corrosion-resistant. Nickel, like platinum and palladium, can absorb a large amount of hydrogen during passivation, and the smaller the particle size, the greater the absorption. The important salts of nickel are nickel sulfate and nickel chloride.

Nickel nitrate is also commonly used in the laboratory, with crystalline water, the chemical formula is Ni(NO3)2·6H2O, green and transparent particles, easy to absorb water vapor in the air. Similar to iron and cobalt, it is more stable to water and air at room temperature, and can resist alkali corrosion, so nickel crucibles can be used to melt alkali in the laboratory. Nickel sulfate (NiSO4) can form alum with alkali metal sulfate.

Your statement is incorrect, it should be that some stainless steel grades contain nickel. The main role of nickel is to stabilize the austenite structure, enhance the cold working performance, and improve the rust resistance. Therefore, nickel-containing stainless steels are mainly austenitic stainless steels and duplex stainless steels.

Ferritic stainless steels and martensitic stainless steels, on the other hand, are largely nickel-free. Because the important indicator of rust prevention is the chromium content, iron-based alloys containing more than 12% chromium are called stainless steels.

1. Look at the model and label of stainless steel:

The name and model of stainless steel also represent different nickel contents.

For example, 304 stainless steel in c, mn<=.

316 stainless steel c, mn<=.

2. Use stainless steel test solution to identify:

As long as a drop is placed on the stainless steel, the potion will react with the stainless steel, and the model of the stainless steel can be judged by the color of the reaction. This gives you an idea of its nickel content.

3. Spark identification method:

It is mainly used in iron and steel, and is a method to identify the chemical composition (constituent elements) and approximate content of materials due to the different number, shape, bifurcation, and color of sparks generated when various elements and particles are oxidized due to friction and high temperature under grinding wheel grinding.

Stainless steel nickel content zone.

1. Stainless steel is generally divided into chromium stainless steel and nickel stainless steel (just one of a variety of classifications), usually we use the magnetic test stainless steel method is only used in part of the stainless steel, in fact, both are more or less magnetic, but chromium-containing stainless steel is more magnetic than nickel-containing stainless steel.

You can use magnets to attract chromium-containing stainless steels, and very weak to nickel-containing stainless steels. If it is only for nickel-containing stainless steel, of course, the weaker the magnetism, the more nickel it contains. This method is also the simplest and most commonly used.

Second, use the rust steel test fluid to identify, the rust steel test solution is called the rust steel potion, to drop some rust steel, the potion horse rust steel reaction, through the reaction of the same color, clearly judge the rust steel model.

3. Spark identification: mainly used for steel, grinding wheel grinding due to friction, high temperature, various elements, particles oxidation production of spark number, shape, fork, color equal, identification of material (group elements) and content species. Good nickel content.

The nickel content is as important as the elements carbon, chromium, manganese and sulfur.

Fourth, the easiest way is to look at the model and number of stainless steel. For example, the name and model number represent different levels of nickel content: 304:

8% nickel grade; 316: 12% nickel; 317: 13% grade nickel ......There are also grades on the national standard, such as 06CR19NI10....

where "ni"The following number indicates the percentage of nickel content.

1. Stainless steel is generally divided into chromium stainless steel and nickel stainless steel, usually we use the magnetic detection method of stainless steel, only in a part of the stainless steel is practical, in fact, there are more than two or lower magnetism, but chromium stainless steel has higher magnetic strength than nickel-containing stainless steel. You can use a magnet to attract chromium stainless steel, a very weak force of attraction for stainless steel that contains nickel. Of course, if it is only applied to nickel-containing stainless steels, the weaker the magnetic force, the greater the nickel content.

This method is also one of the easiest and most common.

2. The rust steel test fluid is used for identification, and the rust steel test solution is called the rust steel potion, and the rust steel is reacted with the dropping point of the rust steel and the rust steel of the potion, and the rust steel model is clearly judged by the same color.

3. Spark identification: It is mainly used for steel, grinding wheel friction grinding, high temperature action, a variety of components, particle oxide spark amount, shape, fork, color equivalence, material identification (group element) and content species. Nickel content is good.

Nickel content, solid carbon, chromium, manganese, sulfur content is important.

4. The easiest way is to look at the stainless steel model and label. For example, the name and model number indicate different levels of nickel content: nickel at 304:

8 levels; 316.% level of nickel content; The nickel content is at the level of . There are also grades of national standards, such as 06CR19NI10,"ni"The number behind it indicates the percentage of its nickel content.

Effect of nickel on stainless steel:

The effect of nickel on the mechanical properties of austenitic stainless steels, especially chromium austenitic stainless steels, depends mainly on the effect of nickel on austenite stability, and the range of nickel content of martensitic transition may occur in steel.

With the increase of nickel content, the strength of the steel decreases and the plasticity increases, the toughness of chromium-nickel austenitic stainless steel with stable austenite structure (including extremely low temperature toughness) is very good, so it can be used as a low-temperature steel, which is well known, for chromium-manganese austenitic stainless steel with stable austenite structure, adding nickel can further improve its toughness.

Nickel also significantly reduces the tendency of austenitic stainless steels to harden in cold work, mainly due to the improved stability of austenitic and the reduction of the elimination of martensitic conversion during cold working.

At the same time, the cold work hardening effect of austenite itself is not obvious, and the influence of cold work hardening tendency of stainless steel reduces the cold work hardening rate of austenitic stainless steel, and reduces the plasticity of the steel. It was determined that the increase in nickel content was beneficial for the cold working and forming properties of austenitic rust, and the increase in nickel content could also be reduced, eliminating delta ferrite stainless steels in 18-8 and 17-14-2 chromium-nickel austenites, thereby improving their heat treatment properties.

Stainless steel nickel content classification method:

1. Stainless steel is generally divided into chromium stainless steel and nickel stainless steel (just one of a variety of classifications), usually the magnetic test method we use stainless steel is only used in part of the stainless steel, in fact, both are more or less magnetic, but chromium-containing stainless steel is stronger than nickel-containing stainless steel, to put it bluntly, you can use magnets to attract chromium-containing stainless steel, and the attraction of nickel-containing stainless steel is very weak. If it is only for nickel-containing stainless steel, of course, the weaker the magnetism, the more nickel it contains. This method is also the simplest and most commonly used.

Second, use stainless steel test liquid to identify, stainless steel test solution is also called stainless steel potion, as long as a drop on the stainless steel, the chemical reaction with stainless steel immediately occurs, through the reaction of different colors, can clearly judge the model of stainless steel.

3. Identification by metal instruments.

4. Spark identification method: It is mainly used for iron and steel, due to friction and high temperature under the grinding wheel grinding, the number, shape, bifurcation, color and other sparks generated when various elements and particles are oxidized, so as to identify the chemical composition (constituent elements) and approximate content of the material. The nickel content is also optimal.

The nickel content is of course, but the content of other elements such as carbon, chromium, manganese, and sulfur is also important and should be paid more attention to!

Look at the name, such as 304: 8% nickel; 316: 12% nickel; 317：

13% grade nickel... Look at the grade on the national standard, such as 06cr19ni10....The number after ni indicates its nickel content...

How to identify the spark does not show the nickel content of the steel.

First, use magnets to attract chromium.

Rusty steel. Stainless steels are generally divided into chromium stainless steel and nickel stainless steel (just one of many classifications), and chromium-containing stainless steel is more magnetic than nickel-containing stainless steel. The magnet is used to attract chromium-containing stainless steel, and the attraction of nickel-containing stainless steel is very weak.

2. Identification with rusty steel test solution. The rust steel test liquid is called the rust steel potion, and the rust steel should be dropped, and the rust steel will be reacted with by the different colors of the reaction, and the rust steel model can be clearly judged through the different colors of the reaction.

3. Spark identification method: a method to identify the chemical composition (constituent elements) and approximate content of materials due to friction and high temperature under grinding wheel grinding of steel, the number, shape, bifurcation, and color of sparks generated by the oxidation of various elements and particles. The nickel content is also optimal.

Fourth, look at the model and number of stainless steel. The name and model number represent the different levels of nickel content: 304:

8% nickel grade; 316: 12% nickel; 317: 13% grade nickel ......There are also grades on the national standard, such as 06CR19NI10....

where "ni"The following number indicates the percentage of nickel content.

304 is the American brand, and the Chinese brand is 06CR19NI10 Product Name Standard: GB T4237-2007 Stainless Steel Hot Rolled Steel Plate and Steel Strip Chemical Composition %

c≤ si≤ mn ≤ cr ： ni：

s ≤ p ≤

Therefore, the content of nickel in the spectrum should be in the range of 8 11.

Answer: Spectral analysis of steel with carbon content greater than, silicon, manganese, chromium, nickel, aluminum is 20 steel.

Quickly identify stainless steel ingredient potions! Easy to use, one bottle can measure 201, 202, 304, 306 four stainless steel materials, one bottle of potion as four bottles of potion effect!

No need for power-up, one-drop measurement.

Rapid identification of stainless steel model 201 202 301 304 The solution is mainly used to identify stainless steel. Stainless steel materials can be quickly and easily distinguished without any auxiliary tools.

Features: 1. No need for any auxiliary tools, easy to carry.

2. It can be detected anytime and anywhere. It is especially suitable for metallurgical furnace analysis and material industry.

3. The operation is simple, as long as the potion is dropped on the stainless steel, the stainless steel model can be judged by looking at the color and reaction speed.

4. Rapid response, no need to turn on electricity, and the stainless steel model can be identified in a few seconds.

Requirements: If there are stains and coatings on the surface, they must be cleaned and then tested.

Application: Drop 1 2 drops of stainless steel identification solution on the material to be measured, wait a few seconds, and show the effect.

1. It does not contain nickel material, and the droplets instantly turn dark red;

stainless steel, the droplets instantly turn dark brown-red;

stainless steel, the droplets turn pale brownish-red in about 5 seconds;

Stainless steel, the droplets turn pale brick red in 1-2 minutes.

Stainless steel, the droplets do not change color within 3-5 minutes.