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Terms definitions about stainless steel heat-resistant steel

2019-11-16
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Terms definitions about stainless steel heat-resistant steel

1. Stainless steel

1. Definition: Steel with stainless steel corrosion resistance as the main characteristics, with a chromium content of at least 10.5% a carbon content of more than 1.2%.

2. Classification:

1) austenitic grade stainless steel

The matrix is mainly austenitic with a face-centered cubic crystal structure, non-magnetic, can be strengthened by cold working stainless steel.

2) Austenitic-ferritic (duplex) grade stainless steel

The matrix has both austenite ferrite two-phase structure (the content of less phases is generally greater than 15%), magnetic, stainless steel that can be strengthened by cold working.

3) ferritie grade stainless steel

The matrix is mainly ferrite structure with body-centered cubic crystal structure, which is magnetic generally cannot be hardened by heat treatment, but cold working can make it slightly strengthened stainless steel.

4) Martensitie grade stainless steel

The matrix is a martensite structure, magnetic, stainless steel whose mechanical properties can be adjusted by heat treatment.

5) precipitation hardening grade stainless steel

The matrix is austenitic martensite structure, can be hardened by precipitation hardening stainless steel.

CFC1

2. Heat-resisting steel

1. Definition: steel with good chemical stability higher strength at high temperature.

3. General guidelines for determining limit values of chemical components

1. Carbon

When the carbon content is greater than equal to 0.04%, two decimal places are recommended, when the carbon content is greater than 0.030%, three decimal places are recommended.

2. Manganese

In addition to Cr-Ni-Mn steel grades, other grades of various types of steel are recommended to use 2.00% 1.00% (large value), but free cutting steel that does contain high sulfur selenium need to increase the high nitrogen solid solubility Grade.

3. Phosphorus

Unless the lower limit is recommended by the manufacturer for technical reasons, the recommended phosphorus content of austenitic steel is more than 0.045%, the phosphorus content of other types of steel grades is more than 0.040%, excluding free-cutting steel grades.

 4. Sulfur

 Unless it is necessary to specify a lower limit value for special technical reasons, the recommended sulfur content of each type of steel grade is greater than 0.30%, but does include free-cutting steel grades.

5. Silicon

The recommended silicon content for flat products pipes is no more than 0.75%, the recommended silicon content for long products forgings is more than 1.00%. For the brands of colleagues who produce long products flat products, the recommended silicon content is more than 1.00%. The higher limit value is determined by the specific product technical requirements.

6. Chrome

The upper lower limits of the composition are recommended to be 2%. If the original composition range is greater than 3%, the compressed composition range should be less than 3%.

7. Nickel

Except for the wide range of ingredients due to special technical requirements (generally higher content), the upper lower limits of ingredients are recommended to be no more than 3%.

8. Molybdenum

Except for the wide range of ingredients due to special technical requirements, the upper lower limits of the ingredients are recommended to be no more than 1%. Except for special technical requirements, the upper lower limits of molybdenum content should generally be specified.

9. Nitrogen

In addition to special technical requirements, the nitrogen content should generally specify upper lower limits.

10. Copper

In addition to special technical requirements, the nitrogen content should generally specify upper lower limits.


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