BS11 BS90A British standard flat bottom rail

BS11 standard steel rail

− qualification test and Standard EN 13674 – 1:2003 consists of two main parts:

− acceptance tests

Qualification tests are some other tests that were previously carried out, as for example, fracture toughness. Acceptance tests characterize the properties of the prescribed tests, which ensure production of high quality rails, and testing requirements of railway administration.

Quality of rails is based on measured values of hardness, by which they introduced new labels for steel rails.

Qualifying tests

Qualification testing must be conducted at least one in five years and the major

changes in technology, production rails. Additional testing residual stresses are carried

out on all types of steel rails every two years maximum, provided that the longitudinal

strain rate in the rails can amount to up to 250 MPa.

The prescribed qualifying examination is the following:

− fracture toughness

− fatigue crack growth rate

− fatigue testing

− residual stress in rail foot

− variation of centre line

− tensile strength and elongation

− segregation

− other qualification requirements

Acceptance tests

Within acceptance testing is carried out a series of laboratory tests such as:

− chemical composition (the maximum content of the following elements: H, O, Al, V, N and oligo elements)

− microstructure (increasing x 500)

− degree of decarburizing charred layer (allowed up to 0.25 mm)

− purity of steel (especially the presence of oxide)

− macrostructure (Baumann test)

− hardness

− tensile strength

Other acceptance testing rails are:

− dimension tolerances

− criteria (control template)

− inspection requirements / tolerances for to internal quality and surface quality

Internal state is examined ultrasound in a continuous process control, and includes at least 70% of the head and at least 60% web.

– Standard of UIC 860 V: 1996 – prescribed four types pearlite steel rails in the range of tensile strength from 700 to 1300 MPa.

– Standard EN 13674 – 2003, provides seven types pearlite steel hardness in the range 200 to 390 HBV, types steel in accordance with EN 13674, based on the values of hardness (R 200, R 220, R 260, R 260 Mn, 320 Cr, 350 HT, 350 LHT).

USAGE OF RAILS	TYPE OF RAILS	STANDARD
Rail for Railway	43 kg/m rail, 50 kg/m rail, 60 kg/m rail, 75kg/m rail, 60N rail, 75N rail	TB/T2344-2012, TB/T3276-2011
	P50 rail/R50 rail, P65 rail/R65 rail	GOST-R51685
	S49 rail, UIC54 rail, UIC60 rail	UIC860
	JIS50N rail, JIS60 rail	JIS E1101
	AS50 rail, AS60 rail, AS68 rail	AS1085, BHP RT STD
	90RA rail, 100RE rail, 115RE rail, 132RE rail, 136RE rail	AREMA
	TR45 rail, TR50 rail, TR57 rail, TR68 rail	ASTM
	BS75A rail, BS90A rail, BS100A rail	BS11 STANDARD
	49E1 rail, 50E2 rail, 54E1 rail, 60E1 rail, 60E2 rail	EN 13674-1
Switch Rail	50AT1 rail, 60AT1 rail, 60AT2 rail, 60TY1 rail	TB/T3109-2013
Crane Rail	A45, A55, A65, A75, A100, A120, A150	DIN536
	QU70 rail/KP70 rail, QU80 rail/KP80 rail, QU100 rail/KP100 rail, QU120 rail/KP100 rail, CR175 rail	YB/T5055-2014 ASTM A759-2000
Grooved Rail	59R2 rail, 60R2 rail	EN 14811:2006