Alloyed Cast
Steel

Carbon contents of Alloyed Cast Steel range between 0.4 to 1.4 % depending of the hardness level. Additions of Cr,Ni, Mo and other alloying elements and the right heat treatment will develop a pearlitic or sorbitic structure.

In case of deep channels and grooves, we recommend a pre-machining of the grooves before the final heat treatmentalloying the hardness to penetrate down to the bottom of the grooves and developing a uniform hardness along the barrel.

Application

Roughing and BD stands of heavy section and medium section mills.

MATERIAL		CHEMISTRY						BARREL HARDNESS (HSC)
MATERIAL		C	Si	Mn	Cr	Ni	Mo	BARREL HARDNESS (HSC)
Alloy Steel	AS60	0.55-0.65	0.20-0.45	0.90-1.20	0.80-1.20	/	0.20-0.45	35-50
	AS65 I	0.55-0.65	0.20-0.60	0.50-1.00	0.80-1.20	0.20-1.50	0.20-0.60	35-45
	AS70	0.65-0.75	0.20-0.45	0.90-1.20	/	/	/	32-42
	AS70 I	0.65-0.75	0.20-0.45	1.40-1.80	/	/	/	35-45
	AS70 II	0.65-0.75	0.20-0.45	1.40-1.80	/	/	0.20-0.45	35-45
	AS75	0.70-0.80	0.20-0.45	0.60-0.90	0.75-1.00	/	0.20-0.45	35-50
	AS75 I	0.70-0.80	0.20-0.70	0.70-1.10	0.80-1.50	≥0.20	0.20-0.60	35-50

TYPICAL PHYSICAL PROPERTIES
GRADE	Neck Hardness (HSC)	Tensile Strength (N/mm²)	Unevenness of Barrel Surface Hardness (HSC)
AS60	≤45	≥650	＜5
AS65 I	≤45	≥650	＜5
AS70	≤45	≥600	＜5
AS70 I	≤45	≥600	＜5
AS70 II	≤45	≥680	＜5
AS75	≤45	≥680	＜5
AS75 I	≤45	≥700	＜

Hardness Distribution

Microstructure

100x

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Piercing Mill Roll

·Materials

Piercer rolls must exhibit a high resistance to wear and good gripping ability under alternating mechanical and thermal stresses. Commonly SMS-meer designs the material for CK45, equivalent to 45 in China. But TSR uses different materials according to different equipments.

· Surface shaping

Surface treatment with high friction and provide good conditions for pipe milling.

Material Table

Code	C	Si	Mn	S,P	Mo	Cr	Ni	V
45	0.40-0.50	0.17-0.37	0.50-0.80	≤0.04	–	≤0.25	≤0.25	–
50	0.47-0.55	0.17-0.37	0.50-0.80	≤0.04	–	≤0.25	≤0.25	–
40Cr	0.37-0.44	0.17-0.37	0.50-0.80	≤0.03	–	0.80-1.10	≤0.03	–
60CrMO	0.55-0.65	0.17-0.37	0.50-0.80	≤0.03	0.30-0.40	0.50-0.80	≤0.25	–
60CrMoV	0.55-0.65	0.17-0.37	0.50-0.80	≤0.04	0.30-0.40	0.90-1.20	–	0.15-0.35
60CrMnMo	0.55-0.65	0.25-0.40	0.70-1.00	≤0.04	0.20-0.30	0.80-1.20	–	–

Alloyed Cast
Steel

Application

100x

TSR | Expert of Mill Rolls

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