GOST 1215-79

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  ГОСТ 1215-79

GOST 1215−79 Casting of malleable cast iron. General specifications (with Amendments No. 1, 2)

GOST 1215−79
Group В81

INTERSTATE STANDARD
CASTING DUCTILE IRON
General specifications
Malleable iron castings. General specifications

OKP 41 1110

Date of introduction 1981−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of automotive industry of the USSR

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 14.09.79 N 3570

3. The period of examination — 1992

4. REPLACE GOST 1215−59

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

6. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

7. EDITION with Amendments No. 1, 2 approved in September 1988, July 1990 (IUS 12−88, 11−90)


This standard applies to the casting of malleable cast iron made from white cast iron and heat treated with the aim of obtaining the desired mechanical properties and microstructure consisting of ferrite and pearlite in various ratios and carbon annealing.

1. BRAND

1.1. Depending on the composition of the metal microstructure of the ductile iron framework is divided into ferritic (f) and pearlite (P) classes.

1.2. Castings made from ductile cast iron the following grades:

KCH 30−6; KCH 33−8; HT 35−10; KCH 37−12 ferritic, characterized by a ferritic or ferritic-pearlitic microstructure of the metallic base;

KCH 45−7; KCH 50−5; 55−4 HT; HT 60−3; KCH 65−3; KCH 70−2; 80−1 KCH, 5 pearlitic class, characterized by a mainly pearlitic microstructure of the metallic base.

The chemical composition of the casting of malleable cast iron ferritic and pearlitic grades given in the Appendix.

2. ASSORTMENT

2.1. The shape and dimensions of the castings shall conform to the drawings approved in the prescribed manner.

Maximum deviations in sizes and weight, machining allowances must comply with the requirements of GOST 26645, forming slopes — the requirements of GOST 3212.

Examples of symbols

Casting of malleable cast iron grades KCH 30−6 ferritic:

Casting KCH 30−6-f GOST 1215−79

Casting ductile iron brand HT 60−3 pearlitic class:

Casting HT 60−3-P GOST 1215−79

(Changed edition, Rev. N 2).

3. TECHNICAL REQUIREMENTS

3.1. Castings of ductile iron shall be manufactured in accordance with the requirements of this standard, GOST 26358, normative-technical documentation (NTD) in the concrete casting according to the drawings approved in the prescribed manner.

(Changed edition, Rev. N 2).

3.2. Mechanical properties of cast iron, ferritic and pearlitic grades shall conform to the requirements specified in table.1.

Table 1

3.3. On the surface of castings made of malleable cast iron pearlitic allowed fringe and obesplozhennym layer with a total thickness of 1.2 mm.

3.4. (Deleted, Rev. N 2).

3.5. The dimensions and size allowed for correction of defects permitted on castings without the hotfix, as well as the conditions of permissible deviations should be established in NTD for specific castings.

The species, number, size and location of defects on the machined, or machined surfaces of castings should be established in NTD for casting.

(Changed edition, Rev. N 2).

3.6. (Deleted, Rev. N 2).

4. ACCEPTANCE

Acceptance criteria shall conform to the requirements of GOST 26358, div.2.

(Changed edition, Rev. N 2).

5. TEST METHODS

5.1. To check the mechanical properties of cast iron cast control samples. For a lot of castings from a single mold melting 8 samples in the middle of casting. When the established technological process of melting cast 4 samples twice a day.

Damn.2

5.3. Of the cast samples consists of four sets: two for primary and two tests in case of testing after re-heat treatment.

5.4. Each sample must be marked with the heat number or the date and serial number of the casting samples. Simultaneously cast all samples must have the same sequence number.

The results of the tests of specimens having defects produced during casting (sinks, foreign inclusions, cracks, etc.), machining or testing, are not taken into account.

Defective samples needs to be replaced with new or from the same batch.

(Changed edition, Rev. N 2).

5.5. Set the main size of the control sample, the estimated diameter of which is equal to 16 mm and the length calculated is 50 mm.

By agreement between manufacturer and consumer can be selected other sample sizes given in table.2, depending on the prevailing thickness of the body casting of the party.

Table 2

mm

Damn.3

Table 3

mm

Notes:

1. The shape and size of the heads, samples can be changed in accordance with the shape and size of a clamping device tensile machine.

2. Diameter deviations of the control sample in any section is calculated shall not exceed ±0.5 mm.

The estimated diameter of the sample is measured during the test with an accuracy of 0.1 mm. Displacement of the parting line is allowed up to 0.2 mm on the side.

5.7. Allowed samples cut directly from castings. Norms of mechanical properties in this case should be established in NTD for specific casting.

5.8. The burst tests is subjected to one of four sets of control samples. The test is performed with an accuracy of up to 9.8 MPa (1 kgf/mm).

5.9. Mechanical testing is carried out in accordance with GOST 27208, GOST 1497.

(Changed edition, Rev. N 1).

5.10. Hardness according to GOST 9012.

5.11. Determination of the microstructure according to GOST 3443.

5.12. Determination of the chemical composition according to GOST 12344 — 12356 GOST, GOST 12362 — 12365 GOST, GOST 22536.0 to GOST 22536.12, GOST 27809.

(Changed edition, Rev. N 1, 2).

5.13. Determination of surface roughness of castings according to GOST 2789.

6. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

Marking, packaging, transportation and storage must meet the requirements of GOST 26358, div.4.

(Changed edition, Rev. N 1).

APP (reference)

APP
Reference

The electronic text of the document
prepared by JSC «Code» and checked by:
the official publication of the
Casting of metals and alloys: SB. Standards. -

M.: IPK Publishing house of standards, 2002