Multi-wire Stranding structures Enables PC Strand Ideal Elements for Large Span Concrete Constructions
PC strands are popular in concrete building as low relaxation and high strength combined steel wire units for concrete reinforcing. The multi-wire structure enables a great strength in concrete pre-stressing. The strand length of 1800mm to 3600mm enables longer span structure construction, makes thinner and lighter elements with a reduction in number of piles. Using pc strands also saves consumption of energy in freight and handling. Especially for large-span concrete constructions in bridges, railway, highway, coal mine, stadiums and multi-storey buildings.

Common strand section profiles include 1x2, 1x3, 1x7 wire structures. Popular strands we offer are 1x7 wire structure unbounded pc steel strands: Diameter 12.7mm 7 wire strands, 15.20mm 7 wire, 15.24mm 7 wire and 15.70mm 7 wire. Weight ranges from 2MT to 4MT. Steel rod materials for processing of PC strands are high carbon steel 77B and 82B. Tensile strength can be 1670Mpa, 1770Mpa, 1860Mpa optional.

Technical Treatment in Production to Ensure Proper Using with Concrete:
The pc strands are made of continued drawing with large deduction stranding then stabilizing treatment;
The carbon steel materials have high rate of yield strength and ultimate strength, Low relaxation;

Steady modulus of elasticity, stress relieved in production, highly fixed with Concrete.

General Technical Information of P. C. Strands:
Structure: 1x7 wire, 1x2 wire,1x3 wire,1x19 wire
Property: Low Relaxation, High Tensile strength
Common type: Unbonded
Materials: Cold drawn steel wire
Tensile Strength: 1470Mpa ~ 1960Mpa
Yield Strength: 1320Mpa ~ 1760 Mpa
Elongation: Not less than 3.5%
Initial Load: Not more than 70%
Relaxation(1000h):No more than 2.5%
Strand Diameter Available: 9.53mm, 12.7mm, 15.2mm, 15.7mm, 17.8mm, 21.8mm
Packing Details: Standard Export Package (Wrapped by steel strips, waterproof cloth sheet, wooden pallet)
Standards: Following international standards in production of PC Strand: GB/T5224 (China Standard), ASTMA416, ASTMA421 (USA), BS5896(UN), JIS3536(Japan), AS/NZS4672(Australia), NBR-7483(Brazil), EN10138(Europe), ISO6934.
Uses: Mainly used as building material reinforcing strand for concrete structures such as Bridge Beam, Mining anchoring, Slope reinforcement, Dam reinforcement, offshore oil platform, Nuclear power plant, railway sleeper, bridges, railway station and multi-floor buildings.

Popular Strands:

Specifications of 1x7 Wire Structure Pre-stressed Concrete Strand:

Specifications	Tensile Strength (Mpa)	Section Area (mm2)	Grease Mass Per Meter (g/m)	Minimum Thickness of Coat (mm)	Friction Factor (ц)	Effect Modulus (k)	Mass per Meter (kg/m)
1*7-Ф12.70	1720 1860 1960	98.7	43	1.0	0.04-0.1	0.003-0.004	0.875
1*7-Ф15.20	1570 1670 1770 1860 1960	140.0	50				1.21
1*7-Ф15.24	1860	140.0	50
1*7-Ф15.70	1860	150.0	53				1.30

 We are listing in the following tables technical details of PC strands meeting different standards.

P. C. Strand Meeting Standard ASTM A 416:
Grade	Normal Diameter (mm)	Tolerance  (mm)	Area of  section (mm2)	Theoretical Weight per  1000 metre	Minimum  breaking  strength  (KN)	Minimum load At percent extension (KN)	Elonga- tion  (%)	Relaxation after  1000hrs at
								Initial     Load  70%	Initial Load  80%
250	9.53	+/-0.40	51.61	405	89.0	80.1	3.5	2.5	3.5
	11.11		69.68	548	120.1	108.1
	12.70		92.90	730	160.1	144.1
	15.24		139.35	1094	240.2	216.2
270	9.53	+0.65	54.84	432	102.3	92.1	3.5	2.5	3.5
	11.11	-0.15	74.19	582	137.9	124.1
	12.70		98.71	775	183.7	165.3
	15.24		140	1102	260.7	234.6

P.C. Strand Meeting Standard BS5896
Strand type	Normal  Dia. MM	Tensile strength (Mpa)	Specified breaking load (KN)	Load at 1% Elongation (KN)	Minimum Elongation at max load-1%	Relaxation Value 1000h
						Initial	Initial	Initial
						Load 60%	Load 70%	Load 80%
7-wire standard	9.3	1770	92	81	3.5	1	2.5	4.5
	11	1770	125	110
	12.5	1770	164	144
	15.2	1670	232	204
7-wire super	9.6	1860	102	90	3.5	1	2.5	4.5
	11.3	1860	139	122
	12.9	1860	186	163
	15.7	1770	265	233
7-wire drawn	12.7	1860	209	184	3.5	1	2.5	4.5
	15.2	1820	300	255
	18	1700	380	323

JISG 3536 Standard PC Strand Shall Meet the Following Specifications:

Strand Type	mm   Nominal Diameter	mm Diameter Tolerance	mm2 Nominal Area	KG/1000m Nominal Weight	KN Min. Breaking Strength	KN Min. Yield Strength	Min. Elongation at Max Load	Relaxation
								Initial Load Of Min Nominal Breaking Strength	1000h Value No More Than
15-7AN	9.3	+0.4 -0.2	51.61	405	88.8	75.5	3.50%	70%	2.50%
	10.8		69.68	546	120	102
15-7AL	12.4		92.9	729	160	136
	15.2		138.7	1101	240	204
15-7BN	9.5		54.84	432	102	86.8
	11.1		74.19	580	128	118
15-7BL	12.7		98.71	774	183	156
	15.2		138.7	1101	261	222
15-19W 15-19L	17.8	+0.6 -0.25	208.4	1652	387	330
	21.8		312.9	2482	573	495
	28.6		532.4	4229	949	807

AS 1311 Standard PC Shall Meet the Following Specifications:

Type	mm   Nominal Diameter	mm Diameter Tolerance	mm2 Nominal Area	KG/1000m Nominal Weight	Min. Breaking Strength	Min. Yield Strength	mm Min. Elongation at Max Load	Relaxation
								Initial Load Of Min Nominal Breaking Strength	1000h Value No More Than
Common Strand	9.3	±0.4	52	410	94	85%Min   Breaking strength	3.50%	70% 80%	2.5%   4.5%
	10.9		71	555	125
	12.7		93	740	165
	15.2		139	1090	227
	18		199	1560	311
Supper Strand	9.3	±0.4	55	430	102
	10.9		75	590	138
	12.7		100	785	184
	15.2		143	1125	250
	18		199	1560	338
Extra- high tensile steel strand	15.2	±0.4	143	1125	261