How to identify the carbon content of carbon steel 15

I just know to look at the grade difference.

Carbon structural steel: used in the manufacture of engineering structures (such as bridges, ships, buildings, high-pressure vessels, etc.) and mechanical parts (such as gears, shafts, screws, nuts, connecting rods, etc.), this kind of steel is generally low-carbon (carbon content 0 medium carbon (carbon content steel.

Carbon tool steel: used to make various tools (such as cutting tools, molds and measuring tools, etc.), this type of steel is generally high-carbon steel.

The grade of carbon structural steel uses two digits to express the average carbon content of parts per ten,000, such as 45 steel means C=, high-quality carbon structural steel.

The grade of carbon tool steel is indicated by an additional number after the first letter "t" in the Chinese pinyin of the word "carbon", and the number indicates the average carbon content in thousands, such as t8 means c =

The carbon content of steel is generally less than 2%. First, the concept of steel:Steel is an iron-carbon alloy.

According to the national standard, it refers to the material with iron as the main element, the carbon content is generally less than 2%, and contains other noisy elements.

Second, the main elements of steel:In addition to iron and carbon, there are silicon, manganese, sulfur, phosphorus, etc.

3. Classification of steel:1.According to the difference in carbon contentThe carbon content is low-carbon steel.

The carbon content is medium carbon steel, and the carbon content is high carbon steel.

2.It is divided according to the total content of alloying elementsThe total content of alloying elements is 5% for low-alloy steel, 5% for the total content of alloying elements, 10% for medium-alloy steel, and 10% for high-alloy steel.

The above content reference: Encyclopedia - Steel.

Steel is a general term for iron-carbon alloys with a carbon content and mass percentage between to. The chemical composition of steel can vary greatly, and steels that contain only the carbon element are called carbon steel (carbon steel) or ordinary steel. Generally, the higher the carbon content in carbon steel, the greater the hardness and the higher the strength, but the lower the plasticity.

Classified by high and low carbon content.

Low carbon steel: the carbon content is generally lower than the mass fraction);

Medium carbon steel: carbon content is generally mass fraction);

High carbon steel: the carbon content is generally higher than the mass fraction).

Steel properties and uses

1) Carbon structural steel.

Carbon steel, which is used in buildings, bridges, ships, vehicles and other structures, must have a certain strength, and require impact performance and welding performance if necessary.

2) Low-alloy high-strength structural steel.

Used in buildings, bridges, ships, vehicles, pressure vessels and other structures, the carbon content (smelting analysis) is generally not greater, the sum of alloying elements is generally not greater than that, the yield strength is not less than 295MPa, and it is a low-alloy steel with good impact toughness and welding performance.

3) Tool steel.

A general term for steel used in the manufacture of various cutting tools, forming tools, and measuring tools. It is usually divided into unalloyed tool steel, alloy tool steel and high-speed tool steel. The required properties are mainly strength, toughness, hardness, wear resistance and temper stability.

The percentage of carbon content of steel is between the best and the next.

Iron with a carbon content of more than 2 is generally called pig iron.

Iron with a lower carbon content is called wrought iron.

Iron with a carbon content in the middle is called steel. The chemical composition of steel can vary greatly and contain only the element carbon.

The steel is called carbon steel.

carbon steel) or ordinary steel; In actual production, steel often contains different alloying elements according to the non-combustible use of the steel, such as: manganese, nickel, vanadium and so on.

Notes:

1. When adding drainage sand, the brick and the nozzle must be filled with fullness, and the nozzle should be in the shape of a ball crown.

2. Maintain the cleanliness of the bricks and the flow steel channel before feeding, and there shall be no residual steel and residue, so as not to affect the self-opening rate.

3. Packaging: ensure dryness and moisture-proof. Conditional manufacturers can be pre-baked before use, and the single weight and material can be provided according to user requirements.

4. The ladle should be baked to a red-hot state (above 1100) before use, and the cold furnace and cold ladle are prone to occur and cannot be automatically poured.

1 mild steel. Usually c%, called mild steel, has lower strength, better plasticity and weldability.

2.Medium carbon steel.

c% in, called medium carbon steel, has higher strength, but poor plasticity and weldability.

3.High-carbon steel.

c%, called high-carbon steel. Plasticity and weldability are very poor, but they will have high strength and hardness after heat treatment.

The carbon content of high-carbon steel is between years and years, and more than 2% is cast iron.

The percentages are between to.

The most commonly used medium carbon quenched and tempered steel, with good comprehensive mechanical properties, low hardenability, and easy cracks when water quenched. Small parts should be quenched and tempered, and large parts should be normalized.

After quenching and tempering, it is used to manufacture medium-speed, medium-load parts, such as machine tool gears, shafts, worms, spline shafts, thimble sleeves, etc., and is used to manufacture high-hardness and wear-resistant parts with high surface hardness after quenching and high-frequency surface quenching, such as gears, shafts, spindles, crankshafts, mandrels, sleeves, pins, connecting rods, screws and nuts, intake valves, etc.

The main difference between pig iron, wrought iron and steel is the carbon content, iron with a carbon content of more than 2 is called pig iron; Iron with a lower carbon content is called wrought iron. Iron with a carbon content of 0 05 2 is called steel.

(1) Carbon steel: AMild steel (c; b.Medium carbon steel (c; c.High-carbon steel (c.

Generally, the carbon content is less than wrought iron or pure iron, the content is called steel, and the content above is called pig iron.

According to the description of the question, the answer is as follows:

1. The carbon content of carbon tool steel ranges from 0.65% to 1.35%. There are a total of 8 grades of carbon tool steel in the 77 type of the Chinese national manuscript Yanjia standard GB1298.

2. The carbon content of low-carbon steel is generally less than 0.25%, and its strength is relatively low, but the plasticity and toughness are relatively good. Bend.

3. The carbon content of medium carbon steel is generally 0.3% to 0.6%, and it has a high degree of strong bond silver, but the plasticity and toughness are poor.

4. The carbon content of high-carbon steel is generally greater than 0.6%, and its strength and hardness are higher, but the plasticity and toughness are poor.

According to the description of the question, the answer is as follows:

1. The carbon content of carbon tool steel ranges from 0.65% to 1.35%. There are a total of 8 grades of carbon tool steels in the 77 types of the Chinese national standard GB1298.

2. The carbon content of the low-carbon steel manuscript wheel is generally less than 0.25%, and its strength is relatively low, but the plasticity and toughness are relatively good.

3. The carbon content of medium carbon steel is generally 0.3 percent to 0.6 percent, and it has high strength, but poor plasticity and toughness.

4. The carbon content of high-carbon steel is generally greater than 0.6 percent, and its strength and hardness are high, but the plasticity and toughness are poor.