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Rock Drill Steels

Performance:High fatigue strength and toughness

Resistance:High resistance to wear and permanent distortion

Tolerance:Close tolerances (for automated manufacturing process)

Heat Treatment:A uniform response to heat treatment

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Rock Drill Steels

About Hollow Drill Steels

Drill steel for the manufacturing of top-hammer rock drill rods, available in four different steel grades. Our hollow drill steel is characterized by a number of properties that enable efficient production.

China-made Wear Resistance Advantages

We offer WR-Steel in a wide range of steel grades that can be tailored to your needs. WR-Steel is made as hot-rolled round or flat bar, as tubes, or as grinding media. WR-Steel can also be delivered in more than 680 special profiles in close to net shape. It’s all about helping you optimize your operations.
Over the years, we’ve built a reputation for offering a consistent level of quality to ensure that you get the same high-quality hardening results – batch after batch. Whether you’re making steel ploughs, buckets, rock drilling tools or actually processing the rock, your success is our success.

Parameter

List of materials

Sanbar 20	A high-strength chromium-molybdenum steel with high fatigue strength and excellent wear resistance in the as-rolled condition.		Integral drill steels, pilot rods and tapered rods
Sanbar 23	An air-hardening, high chromium-molybdenum alloy steel with good response to surface induction hardening and suitable for carburizing. It has high fatigue strength and wear resistance in the case-hardened condition.		Extension rods, shank rods and tapered rods
Sanbar 61	A high-strength silicon steel with good toughness and impact resistance in the as-rolled condition.		Tapered rods, pilot rods and integral drill steels
Sanbar 64	An air-hardening, high nickel alloy steel with good response to carburizing. It has excellent fatigue strength and wear resistance in the case hardened condition.		Extension rods, shank rods and tapered rods
Grade		Decarburization

Decarburization

Sanbar 20	The maximum permissible decarburization depth is 0.20 mm (0.008 in.) on the outer surface and 0.10 mm (0.004 in.) on the inner surface.
Sanbar 23	The maximum permissable decarburization depth is 0.30 mm (0.012 in.) on the outer surface and 0.20 mm (0.008 in.) on the inner surface.
Sanbar 61	The maximum permissable decarburization depth is 0.30 mm (0.012 in.) on the outer surface and 0.10 mm (0.004 in.) on the inner surface.
Sanbar 64	The maximum permissable decarburization depth is 0.30 mm (0.012 in.) on the outer surface and 0.20 mm (0.008 in.) on the inner surface.
Grade	Proof strength Rp0.2 MPa (ksi)	Tensile strength Rm Mpa (ksi)	Hardness

Mechanical properties (typical values*)

Sanbar 20	850 (123)	1300 (189)	37-43 HRC
Sanbar 23	1000 (145)	1350 (196)	38-44 HRC
Sanbar 61	820 (119)	1350 (196)	38-44 HRC
Sanbar 64	900 (131)	1250 (181)	37-44 HRC

*As-delivered condition

Grade

P Max

S Max

Chemical composition (nominal, %)

Sanbar 20	0.97	0.2	0.3	0.025	0.020	1.0	-	0.2
Sanbar 23	0.24	0.3	0.5	0.020	0.025	3.1	-	0.5
Sanbar 61	0.41	1.5	0.9	0.025	0.020	0.7	0.5	0.2
Sanbar 64	0.22	0.3	0.7	0.020	0.025	1.3	2.9	0.2

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