What is the difference between No. 20 steel and No. 20 steel, and what is the difference between No.

A: It is a kind of steel, which is the abbreviation of No. 20 high-quality carbon structural steel.

The difference between 20 steel and 20 steelShanghai Xiangqia metal team, looking forward to your consultation!

One belongs to alloy steel and one belongs to stainless steel.

Physical properties: density: g cm3 melting point: 1357-1430

Characteristics: 20 stainless steel has good corrosion resistance to sulfuric acid chemicals, and good resistance to chloride, phosphoric acid and other environmental corrosion. It resists sensitization and resultant mesocrystalline corrosion with stable niobium-containing elements, and it also has good mechanical properties and processability.

Applications: Chemical, food, pharmaceutical and plastics industries, heat exchangers, pickling equipment, synthetic rubber production equipment, pumps, valves and pipelines.

The alloy is a stainless steel with extremely high corrosion resistance to sulfuric acid. It can be widely used in high-concentration, high-temperature sulfuric acid environment. In addition, it also has excellent resistance to intergranular corrosion and stress corrosion cracking.

Processability.

It can be treated in the same way as ordinary austenitic stainless steels.

Weldability. As with quasi-austenitic stainless steels, TIG, MIG and manual arc welding can be used, and due to their NB content, we recommend minimizing heat treatment. Use ER320 and ER320LR for solder.

Machinability. Machinability is approximately the same as that of standard austenitic stainless steels. For cutting, use high-speed steel tools or cemented carbide tools, and it is best to slow down the advance speed and increase the depth of cut.

Heat treatment. Stable heat treatment conditions are 925 1010 (ASTM A480 A480M specified conditions), heat treatment must be quenched.

1. The quality is different.

Q235 is an ordinary carbon structural steel, and the ordinary carbon structural steel plate is a kind of steel material. No. 20 steel is high-quality carbon steel, and the quality is due to Q235 carbon steel.

2. The carbon content is different.

The carbon content of Q235 supersaturated carburized surface exceeds that of molybdenum high-speed steel, and the surface composition is close to that of molybdenum high-speed steel. The 20 of No. 20 steel refers to the carbon content and belongs to low-carbon steel.

3. The elements contained are different.

Q235 ordinary carbon structural steel contains impurity elements such as sulfur and phosphorus, and No. 20 steel high-quality carbon steel mainly contains inert elements such as manganese and silicon, so it is relatively stable.

The steel belongs to high-quality low-carbon carbon steel, cold extrusion, carburizing and hardened steel. The steel has low strength and good toughness, plasticity and weldability. The tensile strength is 253-500MPa and the elongation is 24%.

In addition to containing carbon (C) elements and a certain amount of silicon (Si) for deoxidation, the steel does not contain other alloying elements (except for residual elements) except for manganese (mn) (generally not exceeding, higher alloying elements).

Usually, the carbon content less than is called wrought iron, the one that is greater than the amount is pig iron, and the middle is steel.

Uses: It is suitable for the manufacture of small and medium-sized carburizing carbonitriding and other parts that are not very important in the manufacture of automobiles, tractors and general machinery manufacturing industries, such as handbrake shoes, lever shafts, gearbox speed forks, transmission passive gears and camshafts on tractors, suspension equalizer shafts, equalizer inner and outer bushings, etc.; It is used in the hot rolled or normalized state to manufacture various mechanical parts that are not stressed much and require high toughness.

In heavy and medium-sized machinery manufacturing, such as forged or pressed tie rods, hooks and loops, levers, sleeves, clamps, etc. In the steam turbine and boiler manufacturing industry, it is mostly used for pipes, flanges, couplings and various fasteners working in non-corrosive media with a pressure of 6N square and a temperature of 450; It is used in railways and rolling stock to manufacture crossheads, pistons and other castings.

Answer: Hello dear, good morning, No. 20 steel belongs to low carbon steel; Contains a certain amount of manganese, and the content is in between. 20 steel plate is mainly thin plate, coil plate, No. 20 steel plate mechanical properties: tensile strength 410MPa; Yield Strength:

245mpa；Elongation after breakage: 25; Section shrinkage: 55; Do not make shocks.

No. 20 steel is mostly used in the steam turbine and boiler manufacturing industry for pipes, flanges, couplings and various fasteners working in non-corrosive media with a pressure of 6n square and a temperature of 450; It is used in railways and rolling stock to manufacture crossheads, pistons and other castings. As the carbon content of No. 20 steel decreases, the rigidity also decreases, and the finish after processing is very low.

Hello dear, good morning, No. 20 steel belongs to low carbon steel; Contains a certain amount of manganese, and the content is in between. 20 steel plate is mainly thin plate, coil plate, No. 20 steel plate mechanical properties: tensile strength 410MPa; Yield Strength:

245mpa；Elongation after breakage: 25; Section shrinkage: 55; Do not make shocks.

No. 20 steel is mostly used in the steam turbine and boiler manufacturing industry for pipes, flanges, couplings and various fasteners working in non-corrosive media with a pressure of 6n square and a temperature of 450; It is used in railways and rolling stock to manufacture crossheads, pistons and other castings. As the carbon content of No. 20 steel decreases, the rigidity also decreases, and the finish after processing is very low.

20 steel heat treatment and 20 steel quenching hardness:

20 steel heat treatment: As 20 steel, it is possible to achieve an ordinary quenching hardness of 30-35HRC. It's just that due to the high heating temperature, the quenching deformation is large.

No. 20 steelThe material isMild steelSteel is divided into three types according to the carbon content, among which high-carbon steel.

The content of medium carbon is higher, the content of carbon in medium carbon steel tends to be between, the content of carbon in low carbon steel is lower, and the content of carbon in No. 20 steel is, so we say that it belongs to low carbon steel.

Because there is carbon in both steel and iron, the correct distinction between steel and iron is the content of carbon, in most cases, the higher carbon content is iron, and the lower is rigid, but the higher the carbon content of steel and iron, the worse its toughness will be.

Mild steel welding principles

1. On the premise of meeting the performance requirements, materials with better weldability must be selected as much as possible, because low carbon steel and low alloy structural steel with low strength grade (low alloy steel of C and carbon equivalent CE).

2. Be sure to use cheap materials as much as possible, and only use special materials in parts with special requirements to reduce costs - high-speed steel is used for the working part of the twist drill.

Production, the shank is made of carbon steel, and the corrosion-resistant parts are made of composite steel plate or corrosion-resistant alloy is welded on the surface of ordinary structural steel.

Mechanical properties. 1) Phase transition point temperature (approximate) AC1=735, AC3=855, AR3=835, AR1=680

2) Normalizing specification temperature 920 950, air cooling out of the oven. Hardness 131 156hbs.

3) Cold-pressed blank softening treatment specification temperature 700 720, holding time 8 15h, and then at a cooling rate of 50 100 h, the temperature is reduced to 550 600 with the furnace, and the furnace is air-cooled.

The hardness is 143HBS before treatment and 131HBS after softening.

4) Quenching specification Temperature 910-10, 10% NaCl brine cooling.

5) The measured yield strength fy=245MPa, elastic modulus e=206GPA, Poisson's ratio =.

6) The shear strength is 275 392MPa, the tensile strength is 253 500MPa, the yield strength is 275MPa, and the elongation is 25%.

7) The annealing temperature is only 600-650 degrees, and the holding time is 1-2h.

The molecular structure has different carbon content.

The difference between No. 20 steel and No. 45 steel is that the molecular structure and carbon content are different, from the perspective of processing, No. 45 is higher than No. 20 hardness, the difference between No. 45 steel and No. 20 steel is that the material does not pass, the main nuclear banquet is purely if the carbon content is different, one belongs to low carbon steel, one belongs to medium carbon steel.

Uses and standards of No. 20 steel:

It is suitable for manufacturing small and medium-sized carburizing carbonitriding auspicious codes and other parts that are not very important in the construction of automobiles, tractors and general machinery manufacturing industries, such as handbrake shoes, lever shafts, gearbox speed forks, transmission passive gears and camshafts on tractors, suspension equalizer shafts, equalizer inner and outer bushings, etc.

In the hot-rolled or normalized state, it is used to manufacture various mechanical parts that are not stressed much and require high toughness, such as forging or pressed tie rods, hooks and loops, levers, sleeves, fixtures, etc.

No. 20 steel belongs to the low-carbon steel in high-quality carbon structural steel, and the carbon content is about it, so it is named No. 20 steel.

It has good low strength, toughness, plasticity and welding properties of this steel. Implement technical standards, national standard GBT711 to 2017, enterprise standard WTB, steel plate delivery status, delivery in hot rolled or heat treatment state, heat treatment refers to normalizing, annealing or high temperature tempering. <>

No. 20 steel refers to steel with a carbon content. The steel is high-quality and low-carbonCarbon steel, cold-extruded, carburized hardened steel. The steel has low strength and good toughness, plasticity and weldability.

Tensile strengthIt is 253-500MPa and has an elongation of 24%.

No. 20 steel belongs to low-carbon steel; Contains a certain amount of manganese, and the content is in between. 20 steel plate is mainly thin plate, coil plate, No. 20 steel plate mechanical properties: tensile strength 410MPa; Yield Strength:

245mpa；Elongation after breakage: 25; Section shrinkage: 55; Do not make shocks.

No. 20 steel is mostly used in the steam turbine and boiler manufacturing industry for pipes, flanges, couplings and various fasteners working in non-corrosive media with a pressure of 6n square and a temperature of 450; It is used in railways and rolling stock to manufacture crossheads, pistons and other castings. With the decrease of carbon content, the rigidity of No. 20 steel also decreases, and the finish after processing.

Very low.