THN Mining Profiles have been developed for uses in the production of steel arches for public works and underground mines, as well as formworks for tunnels. The use of THN profiles in tunnels and roadways supporting, provides a higher resistance and a yielding support.

GENERAL FEATURES
TYPE Chute-shaped mining profiles
STEEL GRADE 31Mn4 according to DIN 21544
FORM-DIMENSIONS Bars with mass 16.50 / 20.92 / 29.00 Kg/m
LENGTH – TOLERANCES Bar length: 6 to 12 m with +/- 75 mm tolerance
PACKING – WEIGHT Bundles. Weight up to 5,200 Kg per bundle
DIMENSIONS, WEIGHT & TOLERANCES According to FN-SPP-02-98

 

Steel Chemical Composition & Mechanical Properties

Chemical Composition Mechanical Properties
Steel Grade C (%) max P (%) max S (%) max Yield Strength
(N/mm2) min		 Tensile Strength
(N/mm2)		 Elongation 5d0,
(%) min
31Mn4 0,36 0,045 0,045 350 550 18

 

Geometrical Characteristics of Cross Sections
Mass (kg/m) Cross section
F cm2 		Inertia moments Resisting moments
Jx cm4 Jy cm4 Wx cm3 Wy cm3
16.50 21,02 186 223 40 42
20.92 26,65 324 398 61 64
29.00 37,00 616 775 94 103

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