Annealed lron Wire

The annealing process involves high-temperature calcination (approximately 1000 ° C) followed by slow cooling, effectively reducing material hardness, improving flexibility, and shaping ability. Compared to ordinary black iron wire, it has a higher elongation at break and can maintain over 85% shape stability after bending, making it suitable for repeated bending, weaving, or knotting.

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Product Specifications

Product Name	Annealed Black Iron Wire
Material	Q195, Q235, SAE1006, SAE1008 etc.
Wire Diameter	0.3-6.0mm
Surface Treatment	Annealed Or Customers's Requirement
Coil Weight	1kg-500kg/Coil, Or Customers's Requirement
Tensile strength	300~550MPa
Application	Binding Wire, Construction Binding Wire

Wire Gauge Size	SWG(mm)	BWG(mm)	BG(mm)
6	4.87	5.15	5.032
7	4.47	4.57	4.481
8	4.06	4.19	3.988
9	3.66	3.76	3.551
10	3.25	3.40	3.175
11	2.95	3.05	2.827
12	2.64	2.77	2.517
13	2.34	2.41	2.24
14	2.03	2.11	1.994
15	1.83	1.83	1.775
16	1.63	1.65	1.588
17	1.42	1.47	1.412
18	1.22	1.25	1.257
19	1.02	1.07	1.118
20	0.91	0.89	0.996
21	0.81	0.813	0.887
22	0.71	0.711	0.749
23	0.61	0.635	0.707
24	0.56	0.559	0.629
25	0.51	0.508	0.56
26	0.46	0.457	0.498

Core Features

Flexibility and Plasticity

Surface treatment and rust resistance

A layer of black oxide film (iron oxide, Fe2O3) is formed on the surface, providing limited rust protection. But the oxide film is relatively thin and prone to rusting in humid environments, so it is often used indoors or in short-term outdoor scenes. If long-term rust prevention is required, further coating with rust proof oil or blackening treatment can be used.

Specification and strength

Wire diameter range: 0.17mm to 4.5mm (corresponding to wire sizes 5 # to 38 #), covering fine wires (such as 0.3mm for crafts) to thick wires (such as 4.0mm for building binding).
Tensile strength: 350-500N/mm ², meeting most binding and fixing requirements. The single point load-bearing capacity of thick silk for construction can reach 150kg, and the tension of medium diameter bundling for industrial packaging is maintained at 200-300N.

Cost advantage

The production process is relatively simple, without the need for additional processes such as galvanizing, and the price is lower than galvanized iron wire, making it suitable for cost sensitive scenarios.

Production process

Raw material selection

Using Q195 low-carbon steel wire rod with impurity content below 0.15% to ensure material purity and processing performance.

Pulling and Forming

Gradually reduce the diameter of the wire rod through multiple drawing dies to form the desired wire diameter. Lubrication and cooling should be controlled during the drawing process to prevent wire breakage.

Annealing treatment

High temperature calcination: Maintain at around 1000 ° C for sufficient time to eliminate cold work hardening and refine grain structure.

Slow cooling: Cooling at a specific rate (such as 20-25 ° C/min) to stabilize physical dimensions and reduce deformation and crack tendency.
Oxidation layer control: Introduce water vapor or controllable oxygen to promote the formation of a uniform iron oxide film, with a thickness controlled between 5-20 μ m.

Quality inspection

Including 3-point bending test, 5-time tensile cycle test, and salt spray corrosion rating to ensure that the product meets the standards.