High Carbon Silicon Executive Standard

This standard is applicable to deoxidation, silicon addition and carburization in steelmaking and casting, and to effectively improve the element recovery rate and to stabilize the quality of molten steel with high carbon silicon.

1.1 Grade and chemical composition

High-carbon silicon is divided into two grades according to the content of silicon and carbon, and its chemical composition is as shown in Table 1.

Table 1

Grade	Chemical composition/%
	Si	C	S	P	H2O
Si65C15	>65	>15	<0.08	<0.05	<1
Si68C18	>68	>18	<0.08	<0.05	<1

The parameters of silicon and carbon in the above table are allowed to have a difference of 1%-2%, which does not affect the quality of the product.

1.2 Physical state

The supply particle size of high carbon silicon is as specified in Table 2

Table 2 High carbon silicon supply particle size

Specification	Size（mm）	Sum of oversize and undersize
high carbon silicon powder	0-3,0-5,0-8	Not more than 10%
high carbon silicon granule	1-3,3-8	Not more than 10%
high carbon silicon lump	10-50	Not more than 10%
high carbon silicon briquette	10-50	Not more than 10%

The buyer has special requirements on the supply granularity, which can be solved through negotiation with the supplier.

2.1 Sampling

The chemical analysis samples were taken according to GB/T4333.1 (perchloric acid dehydration gravimetric method). No less than 10 points are sampled for each batch, and the sample weight is no less than 5 kg.

2.2 Chemical analysis methods

The chemical analysis method of high carbon silicon is carried out according to GB/T4333.1 (perchloric acid dehydration gravimetric method).

2.3 The particle size test uses a square-hole steel sieve or a square-hole sieve for sieving.

3.1 Quality inspection and acceptance

The quality inspection and acceptance of products shall meet the requirements of GB/T4333.1 《General Regulations for Ferroalloy Acceptance, Packaging, Storage and Transportation, Marking and Quality Certificates》.

3.2 Batch

High carbon silicon is batched according to the same batch number, but the fluctuation range of Si content should not exceed 1%-2%.

4.1 Packaging

High carbon silicon can be delivered in bulk bags, containers, bags, etc. according to the requirements of the buyer. When packaged in bags or containers, there should be obvious signs on the outside of the package.

4.2 Storage and transportation, marking and quality certificate

The storage and transportation, marking and quality certificate of the product shall comply with the requirements of GB/T4333.1 《General Regulations for Ferroalloy Acceptance, Packaging, Storage and Transportation, Marking and Quality Certificates》.

This standard was drafted by Henan Reliable High Carbon Silicon Alloy Co.,Ltd.

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