Mining steel

Grades, Chemical Compositions, and Mechanical Properties of Mining Steel Mining steel is widely used in the coal industry for manufacturing conveyor equipment and support structures. The grades of mining steel vary in their chemical composition and mechanical properties, which determine their suitability for different applications. Chemical Composition of Mining Steel:

Brand	C (%)	Si (%)	Mn (%)	V (%)	P (%)	S (%)
24Mn2K	0.20–0.27	0.17–0.37	1.30–1.80	-	≤0.045	≤0.050
20MnVK	0.17–0.20	0.17–0.37	1.20–1.60	0.07–0.20	≤0.040	≤0.040
20MnK	0.15–0.26	0.20–0.60	1.20–1.60	-	≤0.080	≤0.050
25MnK	0.21–0.31	0.20–0.60	1.20–1.60	-	≤0.080	≤0.050
34SiMnK	0.30–0.38	0.90–1.30	1.00–1.40	≤0.040	-	≤0.040
30Mn2K	0.27–0.34	0.17–0.37	1.30–1.80	-	≤0.045	≤0.050

Note: The vanadium content (mass fraction) of 1.20MnVK round steel is between 0.10% and 0.20%. In addition to the grades listed in the table, other grades can be produced upon agreement between the supplier and the buyer. Mechanical and Process Properties of Mining Steel:

Brand	Steel Diameter or Thickness (mm)	Performance Condition	Yield Point (MPa)	Tensile Strength (MPa)	Elongation δ5 (%)	Cold Bending Test (180°)
24Mn2K	-	Hot Rolling	≥355	≥540	≥20	-
		Tempering	≥590	≥785	≥9	-
20MnVK	10–22 (round steel)	Hot Rolling	≥390	≥570	≥14	d = a
	6–8 (flat steel)	-	-	-	-	-
	10–22 (round steel)	Tempering	≥885	≥1080	≥9	-
	6–8 (flat steel)	-	≥885	≥980	≥9	-
20MnK	≤16	Hot Rolling	≥355	≥510	≥18	d = 2a
	17–25	Hot Rolling	≥355	≥490	≥16	d = 3a
25MnK	≤16	Hot Rolling	≥355	≥540	≥18	d = 2a
	17–25	Hot Rolling	≥355	≥520	≥16	d = 3a
34SiMnK	8	Hot Rolling	≥440	≥610	≥12	-
30Mn2K	-	Hot Rolling	-	-	-	-

Notes: 1. Steel is typically delivered in hot-rolled condition. 2. Quenching and tempering systems are as follows: - 20MnVK: Round steel is quenched at (880±20)°C and tempered at (300±30)°C, followed by air or water cooling. Flat steel is quenched at 880–900°C and tempered at (450±30)°C, then cooled with air or fire. - 24Mn2K: Oil quenched at (850±20)°C, tempered at 400–420°C, and cooled with water. 3. The mechanical properties (tensile strength, yield point, elongation) of 30Mn2K in hot-rolled state should be specified in the quality certificate. 4. This type of steel is suitable for the manufacture of coal mine conveyor equipment and support structures. For more information, visit [http://news.chinawj.com.cn](http://news.chinawj.com.cn) Editor: Hardware Business Network Information Center

Densitometers

Printing density meter,Handheld spectrophotometer,Portable spectrophotometer

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