1x7 Prestressed Steel Strand

Introduce 1x7 prestressed steel strand, low relaxation pre-stressed steel strand is composed by 7 wires, it has the features of high tensile strength and very low relaxation, which make it could replace traditional deformed steel bar well, and save a lot of steel material. Meanwhile ,it make long span concrete construction be possible.

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ADVANTAGES

-Primary advantages

High Tensile Strength

Surface is Clean, and with phosphating layer

Strands distributed neatly on the reel.

-Why should I buy this 1x7 prestressed steel strand ?

In the whole process of manufacturing, the test is no less than 10 times, and all details can be traced.

-What makes this product different to other factory’s 1x7 prestressed steel strand ?

Prestressed steel strand's surface is clean, no grease, no anti-rust oil, this makes the steel have very good bonding performance with concrete.

PC Strand With phosphating layer, it makes the steel be not rust for long time under normal stock condition.

Strands distributed neatly on the reel, this make the strands released very easily, which can reduce the construction time a lot, save cost.

USE

-Where can our 1x7 prestressed steel strand be used?

Our pc strand products are mainly used in construction of long span bridge, hydropower dam, nuclear power plant. And it also could be used long span building, such as large airport, wide cast-in-place floor.

Other use: pole and pile manufacture; hollow core slab manufacture; rock stabilization, slope support, slope reinforcement and other geotechnical engineering; silo construction;

-Some common attentions in using of our 1x7 prestressed steel strand.

Before using, the steel must be tested, only and just only the quality is conform with the requirement from project design party, then the steel can be used.

A high attention must be paid when the PC strand is trucked on very bad road condition or mountain path, a proper fixing and reinforcement to strand coil must be done so that skewed packing coil will not be caused.

-How to use?

Fix the coil in the frame, remove all steel strips, find the end of steel strand which is inside of the coil and in the coil eye, pull out this end of pc strand.

SPECIFICATIONS

- 7 wires pc strand specifications

9.3, 9.53, 12.5, 12.7, 12.9, 15.2, 15.24, 15.7, 17.8

-Technical parameters

PC STRAND GB/T5224-2014, FOR 1X7 PRESTRESSED CONCRETE STEEL STRAND

Structure	Nominal diameter	Tolerance on Diameter	Nominal Area of Section	Weight of strand	Tensile Strength, Rm	Minimum Breaking load,Fm	0,2% proof force , Fp0.2	Elongation Lo=500mm, Agt	Curvative of strand	Lay Length	The Relaxation at 1000h (initial load to 70% of nominal max load ) (r/%) Not more than
	(mm)	(mm)	(mm²)	(kg/1000m)	(N/mm²)	KN	KN	(%)	mm	mm
1X7	9.5	+0.30 -0.15	54.8	430	1860	102	89.8	3.5	Max bow height = 25mm/ 1meter	(12-16)d	2.5
	9.5		54.8	430	1960	107	94.2
	11. 10		74.2	582	1860	138	121
	11. 10		74.2	582	1960	145	128
	12. 70	+0.40 -0.15	98.7	775	1860	184	162
	12. 70		98.7	775	1960	193	170
	15.2		140	1101	1860	260	229
	15.2		140	1101	1960	274	241
	15. 70		150	1178	1860	279	246
	17. 80		191	1500	1860	355	311

PC Strand ASTM A416/A416M:2012, 1X7 PRESTRESSED CONCRETE STEEL STRAND

Grade	Nominal diameter		Tolerance on Diameter	Nominal Area of Section		Weight of strand		Tensile Strength	Minimum Breaking load	Minimum load at 1% Extension	Elongation Lo=610mm	Lay Length	The Relaxation at 1000h (initial load to 70% of nominal max load ) (r/%) Not more than
	(mm)	(in.)	(mm)	(mm²)	(in.²)	(kg/ 1000m)	(lb/ 1000ft)	(N/mm²)	(KN)	(KN)	(%)	mm
270 (1860)	9.53	3/8	+0.65,-0.15	54.8	0.085	432	290	1860	102.3	92.1	3.5	(12-16)d	2.5
	11.11	7/16	+0.65,-0.15	74.2	0.115	582	390	1860	137.9	124.1
	12.7	1/2	+0.65,-0.15	98.7	0.153	775	520	1860	183.7	165.3
	15.24	3/5	+0.65,-0.15	140	0.217	1102	740	1860	260.7	234.6
	17.78	7/10	+0.65,-0.15	189.7	0.294	1487	1000	1860	353.2	318

PC STRAND pr EN10138-3:2011, 1X7 PRESTRESSED CONCRETE STEEL STRAND

Steel Name	Steel Number	Diameter	Tensile strength	Cross-sectional area	Mass per meter	Permitted deviation on mass per meter	Characteristic value of maximum force	Maximum value of maximum force	Characteristic value of 0.1% proof force	Min.Elong. Lo=500mm	Curvative of strand	Lay Length	Relaxation 1000h value no more than (initial load at 70% specified breaking load)
		D	R_m	S_n	M		F_m	Fm,max	Fp0.1
		mm	MPa	mm²	g/m	%	kN	kN	kN	%	mm	mm	(%)
Y1860S7	1.1366	9.3	1860	52	406.1	±2	96.7	111	85.1	3.5	Max bow height = 25mm/ 1meter	(14-18)d	2.5
Y1860S7	1.1366	12.5	1860	93	726.3	±2	173	199	152
Y1860S7	1.1366	15.2	1860	139	1086	±2	259	298	228
Y1860S7	1.1366	15.7	1860	150	1172	±2	279	321	246
Y1960S7	1.1367	9.3	1960	52	406.1	±2	102	117	91
Y1960S7	1.1367	12.5	1960	93	726.3	±2	182	209	162
Y2060S7	1.1368	12.5	2060	93	726.3	±2	192	221	171
Y2060S7	1.1368	12.9	2060	100	781	±2	206	237	183
Y2060S7G*	1.1372	12.7	1860	112	874.7	±2	208	239	183
Y2060S7G*	1.1372	15.2	1860	165	1289	±2	307	353	270
Y1700S7G*	1.137	18	1700	223	1742	±2	379	436	334

7 wires uncoated steel strands could be produced in conformity with more standards:

• BS5896

• ASTMA779

• ISO 6934

• UNE 36094

• JIS3536

• KS D7002

• ABNT NBR7483

• AS/NZS4672

• GOST13840

• GOST-R-53772

PACKAGE

8 steel strips + PE film + packing cloth composed by paper and woven + pallet

Raw material wire rod used for 7 wire PC Strand

Chemical Composition (%):

Designation	C	Si	Mn	P	S
SWRH82B	0.79~0.86	0.10~0.30	0.6~0.9	≤0.03	≤0.03

Mechanical properties (after wire rod aging period)

Designation	Tensile Strength，MPa	Area Reduction，Z/%
SWRH82B	1130-1280	≥30

The wire breaking rate of drawing and stranding (stranding) shall be low (generally less than 3 times per 100 tons)

Inclusion and surface

Designation	Inclusion type	Inclusion grade	Standard
SWRH82B	A、C	≤ Level 2	GB/T24238-2009 or JIS G3506
SWRH82B	B、D	≤ Level 1.5	GB/T24238-2009 or JIS G3506

Class A and C belongs to plastic inclusion, and Class B and D belong to brittle inclusion

The surface of the wire rod shall be smooth and free of such harmful defects as cracks, folds, ears, scars, delaminations and inclusions

Metallographic structure

Designation	Sorbitization rate,%	Total decarburized layer, mm	Grain size, grade
SWRH82B	≥85	not more than 1.5% D	not less than 7

Gas

Designation	[O], ppm	[N], ppm
SWRH82B	≤25	≤60

[O] It is easy to form oxide inclusions, which affects the properties of steel;

[N] Brittle nitride inclusions (TiN, AlN) are easily formed with high N content, and the higher N content, the larger the size of nitride inclusions, thereby reducing the plastic toughness of steel.

Raw Material Supplier

We only use the raw material from ROCKCHECK and XINGTAI IRON& STEEL