"High Chromium Cast Iron Lining Board" Conference

High Chromium Cast Iron Lining Board


The National Building Materials Industry Machinery Standardization Technical Committee held an expert review meeting for the "High Chromium Cast Iron Liner" industry standard project (draft for review) in Xuancheng City, Anhui Province on December 9-10, 2020.

The content of the meeting reviewed documents such as the "High Chromium Cast Iron Lining Board" industry standard submission draft, preparation instructions, and summary processing table for soliciting opinions.
So what is the industry standard for high chromium cast iron liners?

According to [Industry Standard] JCT 691-2010 high chromium cast iron liner, the chemical composition of the liner should meet the requirements of the following table:

chemical composition(%)

C

Si

Mn

Cr

Mo

Ni

Cu

S

P

CBCr 15

1.5-4.5

≤1.5

≤1.5

10-18

≤3.0

≤1.5

≤1.2

<0.06

<0.10

CBCr 20

18-23

CBCr 26

23-28

The mechanical properties of the liner should meet the requirements of the following table:

Codename

Surface hardness(HRC)

CBCr 15

≥58

CBCr 20

≥58

CBCr 26

≥58

About geometric tolerance:

The shape and position tolerance of the bolt hole should meet the requirements of the following table:

Aperture(mm)

≤40

>40

tolerance(mm)


+2
0



+3
0


The straightness and profile tolerance of the assembly surface should meet the requirements of the following table:

basic size(mm)

≤250

>250

Tolerance value(mm)

2

3

About appearance quality:

(1) Gates, risers, sticky sand, flash burrs, etc. on the liner must be cleaned up, and the grinding residues of gates and risers should meet the requirements approved by both the supplier and the buyer.

(2) The bumps at the assembly of the lining board should be polished smooth.

(3) The surface of the lining board should be light-treated, and no defects such as cracks, slag inclusions, sand inclusions, lack of meat, cold partitions, etc., will affect the use.

(4) The surface roughness of the village board should meet the requirements of the drawing or order contract. There is no stipulation in the drawing and the order contract, and it should meet the requirements of Ra 25 in GB/T6060.1.

(5) Flame cutting and welding repair are not allowed on the liner.

Regarding internal quality: cracks, shrinkage holes, shrinkage porosity, pores and other casting defects that affect use are not allowed inside the lining.

In addition to the standards listed above, there are more detailed industry standards for high chromium cast iron liners. Let us look forward to the results of the expert review meeting of the industry standard project of "High chromium cast iron liner" (draft for review)!

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