GOST 28378-89

• gost-28378-89.pdf (453.46 KiB)
  ГОСТ 28378-89

GOST 28378−89 (ISO 5755−2-87, ISO 5755−3-87) powder structural Materials based on iron. Brand

GOST 28378−89
(ISO 5755−2-87,
ISO 5755−3-87)

Group 56

INTERSTATE STANDARD

THE POWDER STRUCTURAL MATERIALS BASED ON IRON

Brand

Iron-based powder structural materials. Types

ISS 77.160
AXTU 1478

Date of introduction 1991−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Academy of Sciences of the Ukrainian SSR

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee on management of quality and standards from 19.12.89 N 3835

3. The standard corresponds to the international standard ISO 5755−2, with the exception of brands ПК10Ф and ПК10Д2Ф and international standard ISO 5755−3 in part ПК10Н2Д2 brands, ПК40Н2Д2, ПК40Н4Д2М, ПК70Н2Д2, ПК20Х13, ПК10Х17Н2, ПК10Х18Н9Т and ПК10Х18Н15

4. INTRODUCED FOR THE FIRST TIME

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

6. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)

7. REPRINTING. January 2006


This standard establishes the brand of structural powder materials based on iron:

mild steels, carbon and copper;

steels Nickel-molybdenum, Medinaceli, Medinaceli and molybdenum;

steels chromium, manganese, chromenickel-manganese;

stainless steels intended for parts used in various branches of engineering.

The standard does not apply to materials subjected to additional heat treatment.

1. Brand chemical composition and physico-mechanical properties of structural powder materials shall be as given in table.1 and 2.

Table 1

________________
* If necessary, doping of sulfur mass fraction of sulfur indicated in the normative and technical documentation on specific product or drawing for design documentation.

Note. The need to control the chemical composition of materials should be specified in normative and technical documentation or drawing for a specific product.

Table 2

________________
* Samsuiluna materials (steel).

Notes:

1. The mechanical properties of the materials correspond to average mass fractions of carbon, alloying elements and the minimum density specified in the designation of steel grades.

2. Norms strength tensile, elongation and hardness of the materials are reference and provided for the selection of material grades.

3. For material grades with a density of 7.4 g/cmor more, and samozalechivayuschihsya material properties given for the annealed condition.

4. The need for control of physico-mechanical properties of materials should be specified in normative and technical documentation on specific product or drawing for design documentation.

2. Microstructure of structural powder materials are given in Appendix 1.

3. Compliance designations of structural powder materials previously used in normative and technical documentation are given in Appendix 2.

4. The symbol marks consists of letters and numbers. The letters indicate: U — the material to powder, for the purpose of the material — structural, the rest of the letters on the content of alloying component (D — copper, X — chrome, p — phosphorus, sulfur, M — molybdenum, G — manganese, T — titanium N — Nickel).

The basis of the material in the designation marks are not specified.

The figures after the letters PC, indicate the average mass fraction of carbon in hundredths of percent. Mass fraction of carbon, equal to 1%, in the designation of the grade of material is not indicated.

The figures after the letters indicate the mass fraction in the material of the alloying elements in percentage; the lack of numbers means that the mass proportion of the component is less than or equal to one.

Designation structural powder material consists of a symbol of its brand, a hyphen, and the minimum density (g/cm).

Examples of symbols

Powder steel structural mild with an average mass fraction of carbon of 0.1% and a minimum density of 6.8 g/cm.

PK10−68 GOST 28378−89

Powder steel structural medicalia with an average mass fraction of carbon of 0.4%, Nickel 2%, copper 2% and minimum density of 6.4 g/cm:

ПК40Н2Д2−64 GOST 28378−89

Steel structural chromium powder with an average mass fraction of carbon 1%, chromium 6% and a minimum density of 7.4 g/cm:

ПКХ6−74 GOST 28378−89

5. For more information about the properties and applications of materials are given in Appendix 3.

6 METHODS TO CONTROL

6.1. Determination of chemical composition

6.1.1. Mass fraction of carbon is determined according to GOST 12344.

6.1.2. Mass fraction of copper is determined according to GOST 12355.

6.1.3. Mass fraction of Nickel is determined according to GOST 12352.

6.1.4. Mass fraction of molybdenum is determined according to GOST 12354 series.

6.1.5. Mass fraction of chromium is determined according to GOST 12350.

6.1.6. Mass fraction of manganese is determined according to GOST 12348.

6.1.7. Mass fraction of titanium is determined according to GOST 12356.

6.1.8. Mass fraction of phosphorus determined according to GOST 22536.3 or GOST 2604.4.

6.1.9. Mass fraction of sulfur is determined according to GOST 12345.

6.1.10. Allowed determination of the chemical composition of the materials using other methods of equal precision measurement requirements of the standards. The differences in the assessment results for determination of chemical composition determination is carried out according to GOST 12344, 12345 GOST, GOST 12348, 12350 GOST, GOST 12352, 12354 series GOST, GOST 12355, 12356 GOST, GOST 22536.3 or GOST 2604.4.

6.2. The density of the materials is determined according to GOST 18898.

6.3. The hardness of the materials is determined according to GOST 9012.

6.4. Tensile strength tensile and elongation of materials with a density of at least 7.4 g/cmdetermined according to GOST 18227, with a density of 7.4 g/cmor more — according to GOST 1497.

ANNEX 1 (reference). Microstructure of structural powder materials

ANNEX 1
Reference

Table 3

________________
* In the presence of sulfur in the column «other components» added «to the inclusion of sulphides».

** Samsuiluna materials (steel).

Notes:

1. For material grades with a density of 7.4 g/cmor more, and samozalechivayuschihsya materials microstructure are shown for the annealed condition.

2. In the structure of materials are pores.

3. In the structure of materials are not permitted in the free state the alloying elements.

4. In the structure of high-carbon materials are trademarks ПК70, ПК70Д3 valid isolated inclusions of cementite.

ANNEX 2 (informative). Compliance designations of structural powder materials under this standard previously used in normative-technical documentation

ANNEX 2
Reference

Table 4

APPENDIX 3 (recommended). For more information about the properties and applications of materials

APPENDIX 3
Recommended

Table 5

________________
* The symbol characteristics of the properties and types of additional processing:

1 — products that are subjected to calibration with the aim of obtaining accurate sizes;

2 — products with a slight change of dimensions during sintering;

3 — products that are well processed by cutting.

4 — products with moderate wear-resistance;

5 — products with high impact strength;

6 — magnetic products;

7 — products that undergo heat treatment according to the current NTD:

7.1 — chemical and thermal;

7.2 — aging;

7.3 — hardened and tempered;

7.4 — annealing to improve machinability.

8 — product corrosion-resistant:

8.1 — in atmospheric conditions;

8.2 — in a slightly aggressive media;

8.3 — corrosive environments;

8.3 in aggressive environments, in addition to boiling solutions of salts and acids;

8.4 — in harsh environments, including boiling solutions of salts and acids;

8.5 — resistant to intergranular corrosion.

9 — heat-resistant products.

10 — product-temperature.

11 — products with a stable coefficient of thermal expansion.

12 — all products, if necessary, can be subjected to protective coatings on the existing NTD.

13 — all products, excluding those containing copper, can be subjected to welding.