Iranian Classification Society Rules

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Section 8 Special Cast Iron Valves


801. Application

The requirements in this Section apply to the tests and inspection for the approval of manufacturing process of special cast iron valves (black heart malleable castings and spheroidal graphite iron cast- ings which has elongation of 12 % or above) specified in Pt 5, Ch 5, 102. 4. of the Rules.


802. Approval tests

Approval tests specified in Table 2.8.1 are to be carried out to verify the material quality of spe- cial cast iron in the presence of the Surveyor. Tensile test and charpy impact test are to be carried

out on the test specimens separately cast and on those taken from the valve body of size.

the

largest


Table 2.8.1 Approval Testing Method and Acceptance Criteria for special cast iron valves


Kinds

Test item

Test method

Acceptance criteria


Spheroidal graphite iron cast- ings


Tensile test

The separately cast test sample is to be of A type specified in KS D 4302. Tensile test is to be carried out on two test specimens taken from test sample at room temperature (in case of boiler mounting valves, at each temperature of 200°C, 300°C and 400°C). Two test specimens (R 14A type specified in Table 2.1.1 of Pt 2, Ch 1 of the Rules) for ten- sile test at room temperature are to be taken from the valve body. (the separately cast test sample is to be heat treated as same as applied to the valve body.)


To comply with the Rule requirements


Charpy impact test

Three each test specimens of R 4 type specified in Table

2.1.3 of Pt 2, Ch 1 of the Rules are to be taken from test sample and flange of valve body.


To comply with the Rule requirements


Hardness test

Valve body is to be cut and hardness at each position is to be measured (Brinnel Hardness Test, 3000 kg).

To comply with the Rule requirements

Micro-structure analysis

Structural ferritization and spheroidization of graphite are to be examined.

To be as deemed appropriate by the Society

chemical com- position

For the analysis of total carbon, a drilling machine is not to be used.

To comply with the Rule requirements


Blackheart malleable iron cast- ings


Tensile test

Test specimen is to be of A type specified in KS D ISO 5922 and shall not be separately casted or machined unless approved by the Society. Two each test specimens are to be subjected to tensile test under the same temperature con- ditions as in Spheroidal graphite iron castings. The tensile test on the test specimens taken from valve body is to be as specified in Spheroidal graphite iron castings.


To comply with the Rule requirements

Charpy impact test


The same as in Spheroidal graphite iron castings

To comply with the Rule requirements


Hardness test


The same as in Spheroidal graphite iron castings

To comply with the Rule requirements

Micro-structure analysis

Examination is to be carried out on the matrix and graphiti- zation,

To be as deemed appropriate by the Society

chemical com- position


The same as in Spheroidal graphite iron castings

To comply with the Rule requirements


803. Dealings after approval

Special cast iron valves which conform to [in approval case] in the requirements in specified by the Society.


the requirements in this Section are to be dealt with as

Pt 2, Ch 1, 201. 2 (2) of the Rules, unless otherwise


36 Guidance for Approval of Manufacturing Process and Type Approval, Etc. 2015

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Ch 2 Approval of Manufacturing Process Ch 2, Sec 9

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