Let s take a closer look at the details of 3Cr12 stainless steel 50

3Cr12 is a 12% CR ferritic stainless steel, equivalent to a European grade, and is an economical ferritic stainless steel used to replace coated carbon steel, weathering steel and aluminum. It has the characteristics of simple processing and manufacturing, and can be welded by conventional welding technology, and has been widely used in recent years.

Features and scope of application:

3CR12 is a weldable ultra-low-carbon stainless steel developed in the 80s of the 20th century. It has medium corrosion resistance, moderate strength, good weldability (welding thickness up to 30mm), no hardening, magnetism, wet wear resistance and sliding properties. It is an economical stainless steel that is widely recognized around the world.

Due to its good properties, it has been widely used in different industrial fields such as transportation, transportation, petrochemical, structural, sugar refining and mining.

Chemical Composition: Carbon C:

Silicon SI:

Manganese mn:

Sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni:

Mechanical properties: tensile strength b (mpa): 450 650 conditional yield strength mpa): 320 ( 6mm), 280 ( 6mm).

Elongation δ5 ( 20 ( 6mm), 18 ( 6mm) Impact energy AKV (J): 50 ( 15mm), 35 ( 15mm) Hardness : 200 ( 12mm), 250 ( 12mm) Comparison of domestic and foreign grades:

South Africa: 3CR12

China GB T 3280-2007:00CR12 EU ENL008:

American Standard A240 A240M - 99: S40977

3cr13 is 420J2 in the Japanese standard, as for 3cr14, people haven't heard of it for the time being, are you making it up yourself?

If there is, then the difference between the two is that the CR content is different, the answer downstairs is wrong, the number "3" in front of it represents the carbon content, it is obvious that their carbon content is the same, but the CR content is different, and the corrosion resistance with high CR content is higher!!

Shenzhen Jinrongfa metal materials****.

3Cr13 has higher strength, hardness and hardenability than 410 (1Cr13) and 420J1 (2Cr13), corrosion resistance in dilute Hno3 and weak organic acids at room temperature (700 degrees), and weldability is not as good as 410 and 410J1.

1. 3CR13 corresponding grades: 1. National standard GB-T standard: digital grade:

S42030, new grade: 30CR13, old grade: 3CR13,2, American standard:

ASTMA Standard: S42080, SAE Standard: A, UNS Standard:

420,3, Japanese standard JIS standard: SUS420J2,4, German standard DIN standard: ,5, European standard EN standard:

X30CR13, French NF standard: Z33C13.

2. 3Cr13 chemical composition: carbon c:, silicon si:, manganese mn: , phosphorus p: , sulfur s:, chromium cr:, nickel ni: allowed, molybdenum mo:, nitrogen n:—, copper cu:— other elements:

3. 3Cr13 physical properties: density density (20).

kg , melting point :1365, specific heat capacity (0 100 ) kg (, thermal conductivity w (

100 , thermal conductivity w (

Linear expansion coefficient. 10-6/k)

0 100 , linear expansion coefficient (10-6 k).

0 594 :12, resistivity (20).

ω.mm2 m), longitudinal modulus of elasticity.

20) GPA: 219, Magnetic: Yes.

4. 3Cr13 mechanical properties: Delivery status: bar solution treatment, plate solution pickling, tensile strength (rm mpa): , elongation strength, elongation a %: 18, section shrinkage (z %):

40。5. 3Cr13 heat treatment: Hardness HBW: annealing 235, quenching and tempering 217, hardness HRB: 99, heating temperature: 800 900, heating method: air cooling or slow cooling.

3CR13 application field: mainly used for high-strength parts and wear parts that bear high-strength pressure load and under corrosive medium conditions, such as knives and springs working below 300 degrees, and working shafts below 400 degrees. bolts, valves, bearings, etc.

20Cr13 and 2Cr13 are the same, the new grade of GB T-1220-2007 is 20Cr13, and the old grade is 2Cr13.

According to the provisions of GB T "Expression Method for Iron and Steel Product Grades", the average carbon content is generally expressed in a few parts per thousand at the head of the grade, and the carbon content of 2Cr13 is 2 parts per thousand; The carbon content of 20Cr13 is 20 parts per 10,000, so its grade is changed from 2 to 20.

20Cr13 stainless steel has high hardness and good corrosion resistance in the quenched state. Many of them are used for cutting tools, which are "cutting edge" martensitic steels, and are also used for surgical tools, such as Brinell high-chromium steel, which is the earliest stainless steel, and is also used as steam turbine blades, etc., with a wide range of applications.

3Cr13 martensitic stainless steel.

Chemical composition. Carbon C:

Silicon SI:

Manganese mn:

Sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni: Allowed to contain

Density is a mechanical property. Tensile strength b (mpa): quenched tempered, 735 conditional yield strength mpa): quenched tempered, 540 elongation δ5 (% quenched tempered, 12

Section shrinkage quenched and tempered, 40

Impact power AKV (J): quenching and tempering, 24

Hardness: annealed, 235HB; Quenching and tempering 48 53HRC heat treatment process.

Heat treatment specifications: 1) annealing, 800 900 slow cooling or about 750 fast cooling; 2) Quenching, 920 980 oil cooling; 3) Tempering, 600 750 quick cooling.

Metallographic structure: The tissue is characterized by a martensitic type.

Delivery status: generally delivered in a heat treatment state, and the type of heat treatment is indicated in the contract; If not indicated, it will be delivered in a non-heat-treated state.

The average carbon content of 3Cr13 is 0,3% and chromium is 13%, respectively

The average carbon content of 4Cr14 is 0,4% and the chromium content is 14%, respectively

The average carbon content of 5Cr15 is 0,5% and chromium is 15%, respectively

The carbon content is the same, but the chromium content is not the same. The chromium content of 3cr14 is a bit higher.

What is 2Cr14 stainless steel2Cr14 is made of martensitic stainless steel, quenched or plexile with good permeability, it has high hardness, toughness, good corrosion resistance, thermal strength and cold deformation performance, and good shock absorption. High or low temperature tempering is required, but the shirt and pants should be avoided from tempering between 370-560. Standard:

GB T 1220-1992 Characteristics and scope of application: 1Cr13 stainless steel Zhengdong has good corrosion resistance and machinability, and 1Cr13 is used as a general-purpose cutting tool. Chemical composition of this paragraph Chemical composition:

Carbon C : Silicon Si: Manganese Mn:

Sulfur s : phosphorus p : chromium cr:

Nickel Ni: Allowed to contain 1Cr13

3CR13 (30CR13) belongs to the national standard martensitic stainless steel, and the executive standard: GB T 1220-2007

3Cr13 (30Cr13) is a martensitic stainless steel with a higher carbon content, which has higher strength, hardness and better hardenability than 1Cr13 and 2Cr13 steels.

However, the corrosion resistance and thermal stability of this steel below 700 are not as good as 1Cr13 and are mainly used for high-strength components, as well as wear parts under high stress loads and in a chamber of corrosive media. It is also widely used in measuring instruments and YI pliers. This steel should not be welded.

3Cr13 stainless steel is suitable for cutting tools, nozzles or plastic molds because of its good polishing performance and wear resistance. After quenching, it can reach a higher hardness than 2Cr13.

The chemical composition of 3Cr13 (30Cr13) is as follows:

Processing characteristics: the hot hail dust hand processing temperature range of 3Cr13 steel is 850 1200, the suitable hot processing heating temperature is 1160 1200, it should be heated slowly before 850, and the furnace temperature of the cold charging furnace should be less than 800. Slow cooling or timely annealing after hot working.

The cold workability of cold-worked 3Cr13 steel is poor, and cold working operation is not recommended, but 3Cr13 steel can produce cold-drawn materials, cold-rolled strips and wires.

1. Heat treatment specifications: 1) annealing, 800 900 slow cooling or about 750 fast cooling; 2) Quenching, 920 980 oil cooling; 3) Tempering, 600 750 quick cooling.

2. Metallographic structure: the tissue characteristics are martensitic type.

3. Martensitic stainless steel can be welded in the state of annealing, hardening and tempering, regardless of the original state of the steel, after welding, a hardened martensitic area will be produced at the adjacent weld bead.

The hardness of the heat-affected zone mainly depends on the carbon content of the base metal, when the hardness increases, the toughness decreases, and this area becomes more prone to cracking, preheating and controlling the temperature between the layers, which is an effective way to avoid cracking.

3Cr13 is a martensitic stainless steel. Martensitic stainless steel is a type of stainless steel that can be hardened by heat treatment, and in layman's terms, it is a type of stainless steel that can be hardened. After quenching, the hardness is high, and different tempering temperatures have different combinations of strength and toughness, which are mainly used for steaming turbine blades, tableware, surgical instruments, etc.

Maharanobis stainless steel:

The main alloying elements of martensitic chromium stainless steel are iron, chromium, and carbon. Figure 1-4 is the Fe-Cr phase diagram of the iron-rich part, such as when the Cr is greater than 13%, there is no phase, such alloy is a single-phase ferritic alloy, and martensite can not be produced under any heat treatment system, for this it is necessary to add austenite forming elements to the inner Fe-Cr binary alloy, so that in terms of expansion, C and N are effective elements, and the addition of C and N elements makes the alloy allow higher chromium content.

3Cr13 stainless steel is a stainless steel with high carbon content (only a little waterproof, almost no acid-proof ability, due to acid pollution of air and water, such stainless steel is easy to rust on many occasions, and the hardness is high, easy to brittle cracking;

304 stainless steel is an American brand, equivalent to China's 0Cr18Ni9, its carbon content is less than or equal to, not only increases the composition of nickel, but also has a high nickel content, has strong waterproof and acid-proof ability, good toughness, not easy to crack.

304 stainless steel is a versatile stainless steel material, which is widely used in the manufacture of equipment and parts that require good comprehensive properties (corrosion resistance and formability). It has excellent stainless corrosion resistance and good intergranular corrosion resistance, which is equivalent to 0Cr19Ni9 in China

0Cr18Ni9). 304 contains 19% chromium and 9% nickel. Tensile strength.

b(mpa) 520, conditional yield strength.

MPA) 205, elongation.

5 (%)40, section shrinkage.

3CR13 is a high-alloy steel, because of the high carbon content, so it has high strength, hardness and wear resistance, but the corrosion resistance is slightly poor, used in some parts with high mechanical property requirements and general corrosion resistance requirements, such as springs, turbine blades, cutting tools, nozzles, valve seats, valves, hydraulic press valves, etc. This type of steel is used after quenching and tempering treatment.

Answer: 3cr13 is a high-alloy steel, because of its high carbon content, it has high strength, hardness and wear resistance, but the corrosion resistance is slightly poor, and it is used for some parts with high mechanical property requirements and general corrosion resistance requirements.

430 is ferritic stainless steel, which has good corrosion resistance and general steel grades, better thermal conductivity than austenite, smaller thermal expansion coefficient than austenite, thermal fatigue resistance, addition of stabilized element titanium, and good mechanical properties of weld parts. It is used for architectural decoration, fuel burner parts, household appliances, and home appliance parts.