This standard applies to hard coals and establishes a method for determining the coking properties of coals and their mixtures. The essence of the method
GOST 9521-1974 Referenced Document
GOST 10742-1971 Brown coals, hard coals, anthracite, combustible shales and coal briquettes. Methods of sampling and preparation of samples for laboratory tests
GOST 2789-1973 Surface roughness. Parameters and characteristics
GOST 3722-1981 Rolling bearings. Balls. Technical requirements*， 1981-04-19 Update
GOST 5632-1972 High-alloy steels and corrosion-proof, heat-resisting and heat treated alloys. Grades*， 2024-04-19 Update
GOST 7164-1978 SSI self-balancing servoinstruments. General specifications*， 1978-04-19 Update
GOST 9815-1975 Brown coals, hard coals, anthracite and combustible shales. Method for sampling of seam samples*， 1975-04-19 Update
GOST 9521-1974 history
2017GOST 9521-2017 Hard coals. Method for the determination of coking property
1974GOST 9521-1974 Coals. Method for the determination of coking property