GB/T 37308-2019Oil-based needle coke (English PDF)

4.3

The technical indicators of calcined oil-based needle coke for graphite electrodes are shown in Table 3.

4.4

When there are special needs, it will be determined by both parties through negotiation.

5.1

Determination of true density shall be carried out in accordance with the provisions of GB/T 32158.

5.2

The determination of sulfur content shall be carried out in accordance with the provisions of GB/T 24526, GB/T 387 and GB/T 2286, of which GB/T 24526 is the arbitration method.

5.3

Determination of nitrogen content shall be carried out in accordance with the provisions of GB/T 19227.

5.4

Determination of volatile matter shall be carried out in accordance with the provisions of YB/T 5189.

5.5

Determination of ash content shall be carried out in accordance with the provisions of GB/T 1429.

5.6

Determination of dry base moisture shall be carried out in accordance with the relevant regulations in GB/T 2001.

5.7

The preparation of the coefficient of thermal expansion (CTE) sample is carried out in accordance with the provisions of GB/T 32158, and the measurement method is in accordance with the provisions of GB/T 3074.4 conduct.

5.8

The tapped density sample is crushed step by step according to the requirements in GB/T 1997, mixed and reduced to 1kg, and then reduced to 500g by the dichotomy method.

The 500g sample is broken into 1mm~2mm (round hole sieve) samples of not less than 150g for testing, and the measurement method is in accordance with GB/T 21354 will be carried out.

6.1

The quality inspection and acceptance of oil-based needle coke shall be carried out by the quality supervision and inspection department.

6.2

The sampling and preparation of samples shall be carried out in accordance with the provisions of GB/T 1997.

6.3

Take 500t as a batch, and inspect as a batch if it is less than 500t.

6.4

When there are unqualified items in the product, the unqualified items should be re-checked with double samples. If the inspection is qualified, this batch of products is judged to be qualified.

If it is still unqualified, the batch of products is unqualified.

6.5

The rounding of numerical values shall be carried out in accordance with the provisions of GB/T 8170.

7.1

The packaging, marking, storage, transportation and quality certificate of oil-based needle coke products shall be carried out in accordance with the provisions of GB/T 8719.

7.2

The packaging bag should also be marked. product name, product standard number, batch number, grade, net weight, supplier name, address, etc.

7.3

It should be protected from moisture and rain during transportation.

7.4

It should be stored in a dry, ventilated and cool fixed warehouse with fireproof function.

7.5

Each batch of manufactured products should be accompanied by a quality certificate, which should include. product name, product standard number, batch number, grade, net weight, supplier

Name and address, date of manufacture and various test results specified in this standard.