What is LCB and what is LCC?

LCB LC1 stands for the material of steel for low temperature use. It is suitable for castings of martensitic and ferritic steel, which is the main material of the valve under low temperature conditions.

Reason. The ASTM A352 352M standard includes 9 grades of low-temperature steel castings, including LCA, LCB, LCC, LC1, LC2, LC2-1, LC3, LC4, LC9, and CA6NM, and the applicable low-temperature grades range from -32 (LCA) to 196 (LC9). The L in the steel number represents the steel for low temperature, C represents the type of material for casting, and the following A, B, and C indicate that they belong to the carbon steel series, which are arranged according to the applicable temperature of the steel, and the better the mechanical properties, the better the low temperature performance and the lower the temperature of the impact test, respectively, LCA (32) LCB and LCC (-46) Although the impact test temperature of LCB and LCC are -46, the average value of the 3 samples and the minimum value of the 3 samples LCC are greater than the LCB.

The third digit is represented by Arabic numerals, indicating that it belongs to the alloy steel category, the higher the number, the better its low temperature performance, and the lower the temperature of the low temperature impact test. They are LC1 (59) LC2 and LC2 - 1 (73) LC3 (101) LC4 (115) LC9 (196), among which the commonly used LCB, LC1, LC2 and LC3 have been converted into China's low-temperature steel casting standard for valves JB T 7248, which is called low-temperature carbon steel, steel, steel and steel according to its main chemical elements.

Distinguish between 304 304L and 316 316L in stainless steel.

LCC steel is a kind of low-carbon steel adapted to use in cold areas, and has good comprehensive mechanical properties after heat treatment.

LCC is the most commonly used ferritic cryogenic steel for cryogenic valves, and they are suitable for use in 46 0 environments according to ASTMA 352 A352M.

LCC steel is a carbon steel with a lower carbon content, which is also known as mild steel because of its low strength, low hardness and softness. It includes most of the ordinary carbon structural steel and some high-quality carbon structural steel, most of which are used for engineering structural parts without heat treatment, and some are used for mechanical parts that require wear resistance after carburizing and other heat treatments.

Mild steel is carbon steel with lower carbon content, which is also known as mild steel because of its low strength, low hardness and softness. It includes most of the ordinary carbon structural steel and some high-quality carbon structural steel, most of which are used for engineering structural parts without heat treatment, and some are used for mechanical parts that require wear resistance after carburizing and other heat treatments.

The annealed structure of mild steel is ferrite and a small amount of pearlite, which has low strength and hardness, and good plasticity and toughness. Therefore, its cold formability is good, and it can be cold formed by crimping, bending, stamping and other methods.

This steel also has good weldability. Low carbon steel generally refers to steel with carbon content between This type of steel has low hardness and good plasticity, which is convenient for the use of cold plastic deformation molding process, welding and cutting, and is often used in the manufacture of chains, rivets, bolts, shafts, etc.

LCB is a kind of low-temperature carbon steel in the American standard, which is a cast steel grade, and 20 is a national standard high-quality carbon structural steel, which is a low-alloy steel. The temperature range is -46 343, which is used to make more valves. Low-temperature steel can be divided into two categories: body-centered cubic ferritic low-temperature steel and face-centered cubic austenitic low-temperature steel according to the crystal lattice type.

LCB is a kind of low-temperature carbon steel in the Meili standard, which is a cast steel grade, and 20 is a high-quality carbon structural steel based on national standard slag, which is a low-alloy steel. The temperature range is -46 343 , which is used to manufacture many valves. Low-temperature steel can be divided into two categories: body-centered cubic ferritic low-temperature steel and face-centered cubic austenitic low-temperature steel according to the crystal lattice type.

1. LCB is a kind of low-temperature carbon steel of the American standard, which is a cast steel grade, and 20 is the national standard high-quality carbon structural steel. It is a kind of rolling buried low alloy steel, the temperature range is sold to be -46 343, which is generally used to manufacture valves.

2. Its chemical composition: c; si≤;mn≤;p≤;s≤;tramp elements; CR large with ants; mo≤;v≤;ni≤;cu≤；Total impurities 1%.

LCP is a special engineering plastic raw material, which has excellent heat resistance and molding processing performance, and generally presents liquid crystals in the molten state, and the polymerization method is mainly melt polycondensation. It has the characteristics of unconventional fibrous structure, so the liquid crystal plastic without reinforcement can reach the level of excess mold to exceed the mechanical strength and modulus of ordinary engineering plastics.

LCP can be used in sporting goods, brake pads, films, flexible printed lines, microwave oven containers, satellite electronic components, jet engine parts, sub-electrical and automotive mechanical parts, etc.

LCB is the American Standard.

A low-temperature carbon steel.

It's cast steel. Grade, 20 is the national standard high-quality carbon structural steel. It is a kind of low alloy steel, the temperature range is -46 343, which is generally used to manufacture valves.

Its chemical composition:

c≤;si≤;mn≤;p≤;s≤;tramp elements;

cr≤;mo≤;v Judgment of quarrel; ni≤;cu≤；Total impurities 1%.

Distinguish between 304 304L and 316 316L in stainless steel.