Copper-Clad Steel Grounding Materials

Henan Chalco Copper-Clad Steel Grounding Materials

Henan Chalco supplies high-conductivity copper-clad steel grounding materials for lightning protection, earthing systems and industrial electrical projects. Our product range includes copper-clad steel round wire, copper-clad steel strand wire, copper-clad steel grounding rods, copper-clad steel flat wire, hot-dip tinned copper-clad steel flat wire, copper-clad steel fine wire, exothermic welding powder, molds and grounding installation accessories.

For petrochemical plants, coal chemical projects, rail transit, wind power, solar power stations, power communication systems and industrial facilities, grounding materials must provide stable conductivity, mechanical strength, corrosion resistance and reliable long-term buried performance. Henan Chalco helps customers select suitable copper-clad steel products according to conductivity requirements, copper layer thickness, installation environment and project drawings.

Why Choose Henan Chalco Copper-Clad Steel Materials?

Copper-clad steel combines the conductivity and corrosion resistance of copper with the mechanical strength and cost advantage of steel. Compared with pure copper, it helps reduce total material cost. Compared with galvanized steel, it provides better conductivity stability and corrosion resistance in many grounding environments.

Technical Item	Henan Chalco Copper-Clad Steel Capability
Steel core material	Q235A steel
Copper material	T2 copper
Copper purity	≥99.9%
Minimum copper thickness	≥0.254 mm at any point
Conductivity options	25%, 30%, 40% and other project-based requirements
Process	Continuous casting, annealing and hot-dip tinning available
Connection method	Suitable for exothermic welding and grounding installation
Typical applications	Lightning protection, grounding grids, vertical grounding electrodes and industrial earthing systems

Product Range

Product	Alternative Name	Typical Use
Copper-clad steel round wire	Copper-bonded steel round wire / grounding round wire	Grounding grids, buried grounding conductors and lightning protection systems
Copper-clad steel strand wire	Copper-bonded steel stranded conductor	Flexible grounding conductors, field installation and exothermic welding connections
Copper-clad steel grounding rod	Copper-bonded grounding rod / earthing rod	Vertical grounding electrodes, deep buried grounding and power grounding systems
Copper-clad steel flat wire	Copper-bonded flat grounding conductor	Grounding down conductors, equipment foundation grounding and equipotential bonding
Hot-dip tinned copper-clad steel flat wire	Tinned copper-clad steel flat grounding conductor	Coastal, offshore, humid and corrosive grounding environments
Copper-clad steel fine wire	Fine copper-clad steel wire	Automotive wire harnesses, electronic products and special conductive applications
Exothermic welding powder, molds and tool kits	Grounding connection accessories	Reliable grounding conductor connection and site installation

Core Product Introduction

Copper-Clad Steel Round Wire

Copper-clad steel round wire is also known as copper-bonded steel round wire, copper-coated round steel or grounding round wire. It is produced by covering a special steel core with T2 copper through a continuous casting process. The copper purity can reach 99.9% or higher.

This product provides good conductivity, low resistance, fewer joints, strong corrosion resistance, convenient transportation and easy installation. It is a practical alternative to traditional round steel, angle steel and galvanized grounding materials.

Copper-Clad Steel Strand Wire

Copper-clad steel strand wire is suitable for grounding systems requiring flexibility, field installation convenience and reliable exothermic welding. Each point of the single-side copper layer can be greater than 0.254 mm. The conductivity can reach up to 40%, and annealed soft condition can be supplied for easier site construction.

Henan Chalco can supply 3-strand, 7-strand and 19-strand copper-clad steel constructions to balance flexibility, mechanical strength, conductivity and project cost.

Copper-Clad Steel Grounding Rod

Copper-clad steel grounding rods are manufactured by bonding high-purity copper onto a low-carbon steel core. The steel core provides mechanical strength, while the copper layer improves conductivity and corrosion resistance. Copper thickness can be customized from 0.254 mm to 1.0 mm according to project requirements.

The threaded ends are rolled after continuous processing, helping the copper layer and steel core remain tightly bonded in the thread area. This makes the rod suitable for driven installation and long-term underground service.

Copper-Clad Steel Flat Wire and Hot-Dip Tinned Flat Wire

Copper-clad steel flat wire provides good conductivity, corrosion resistance and long service life. Compared with round wire, flat wire can offer better equipotential distribution in some grounding systems. It can be installed close to equipment foundations, cement poles, pipe supports, angle steel supports and steel surfaces.

Hot-dip tinned copper-clad steel flat wire adds an additional tin protection layer. The tin layer thickness can be not less than 35 μm, helping protect the copper layer, improve corrosion resistance and reduce copper oxidation. It is suitable for offshore, coastal, humid and corrosive environments.

Copper-Clad Steel Fine Wire for Electronic Products

Copper-clad steel fine wire is used for automotive wire harnesses, electronic products and other special conductive applications. The product is made by a cladding process and can be customized by diameter, conductivity grade and mechanical condition.

Production Process

Process Stage	Process Name	Technical Description
Raw material selection	Material selection	Steel core uses Q235A steel and copper uses T2 copper. Steel conforms to GB/T 699 and GB/T 700; copper conforms to GB/T 5246 or GB/T 467.
Product specification	Specification control	Minimum copper thickness at any point is not less than 0.254 mm, and copper purity is ≥99.9%.
Continuous casting	Continuous casting process	A physical bonding process without strong acid, strong alkali or heavy-metal plating solution. It helps avoid blistering and supports high-temperature and annealing processes.
Annealing	Annealing process	Annealing temperature is typically 600–650℃. After annealing, the conductor becomes softer and easier to install.
Hot-dip tinning	Hot-dip tinning process	Selected grounding conductors can be hot-dip tinned with tin layer thickness not less than 35 μm to protect the copper layer and improve corrosion resistance.

Technical Data Tables

Single-Wire Copper-Clad Steel Strand Technical Parameters
AWG	Diameter (mm)	Breaking Strength 40% (kgf)	Breaking Strength 30% (kgf)	Breaking Strength 25% (kgf)	Weight 40% (kg/km)	Weight 30% (kg/km)	DC Resistance 40% (Ω/km)	DC Resistance 30% (Ω/km)	Area (cmil)	Area (mm²)
NO.1	8.25	3065	3174	4561	440.5	435.9	0.8058	1.0744	105560	53.49
NO.2	7.35	2633	2835	4021	349.2	345.6	1.0164	1.3551	83694	42.41
NO.3	6.54	2225	2408	3326	276.9	274	1.2819	1.7092	66358	33.62
NO.4	5.83	1855	2001	2747	219.6	217.3	1.6164	2.1552	52646	26.67
NO.5	5.19	1558	1731	2056	174.2	172.3	2.038	2.7174	41738	21.15
NO.6	4.62	1292	1430	1721	138.1	136.6	2.5709	3.4278	33088	16.77
NO.7	4.11	1070	1179	1429	109.5	108.4	3.2413	4.3217	26244	13.30
NO.8	3.67	885	972	1180	86.89	85.98	4.0852	5.4469	20822	10.55
NO.9	3.26	731	799	970	68.9	68.18	5.1516	6.8687	16512	8.37
NO.10	2.91	601	656	787	54.61	54.04	6.4997	8.6663	13087	6.63
NO.11	2.59	498	542	642	43.33	42.88	8.1921	10.923	10384	5.26
NO.12	2.05	273	274	408	27.21	26.96	13.029	17.373	6529	3.31
NO.13	1.83	225	230	324	21.63	21.41	16.41	21.88	5184	2.63
NO.14	1.63	186	182	257	17.15	16.97	20.7	27.6	4109	2.08
NO.15	1.45	136	145	204	13.6	13.46	26.09	34.79	3260	1.65
NO.16	1.29	112	114	161	10.77	10.66	32.96	43.95	2581	1.31
NO.17	1.15	93	91	128	8.563	8.473	41.45	55.27	2052	1.04
NO.18	1.02	77	74	102	6.777	6.706	52.38	69.84	1624	0.82
NO.19	0.91	60	59	81	5.378	5.322	66	88	1289	0.65
NO.20	0.81	50	48	64	4.273	4.228	83.09	110.8	1024	0.52
NO.21	0.72	40	36	70	3.389	3.354	104.7	139.6	812	0.41
NO.22	0.64	31	29	55	2.671	2.643	132.9	177.2	640	0.32
NO.23	0.57	25	23	45	2.131	2.109	166.5	222.1	511	0.26
NO.24	0.51	21	18	36	1.686	1.668	210.5	280.7	404	0.20

3-Strand Copper-Clad Steel Strand Data
Specification	Diameter (mm)	Area (mm²)	Hard Tensile 40% (kN)	Hard Tensile 30% (kN)	Hard Tensile 25% (kN)	Soft Tensile 40% (kN)	Soft Tensile 30% (kN)	Soft Tensile 25% (kN)	Weight 40% (kg/km)	Weight 30% (kg/km)	Weight 25% (kg/km)	Resistance 40% (Ω/km)	Resistance 30% (Ω/km)	Resistance 25% (Ω/km)
3NO.5	9.2	50.31	23.9	25.3	26.3	14.1	14.8	15.3	413.5482	409.77495	407.0079	0.8642	1.152267	1.843627
3NO.4	10.9	63.45	30.1	31.9	33.1	17.8	18.7	19.3	521.559	516.80025	513.3105	0.6852	0.9136	1.46176
3NO.3	11.9	80.01	38	40.3	41.8	22.4	23.5	24.3	657.6822	651.68145	647.2809	0.5422	0.722933	1.156693
3NO.2	12.7	100.86	43.1	46	47.9	28.3	29.7	30.6	829.0692	821.5047	815.9574	0.4394	0.585867	0.937387
3NO.1	14.2	127.23	54.4	58	60.4	35.6	37.5	38.7	1045.8306	1036.2884	1029.2907	0.3417	0.4556	0.72896

7-Strand Copper-Clad Steel Strand Data
Specification	Diameter (mm)	Area (mm²)	Hard Tensile 40% (kN)	Hard Tensile 30% (kN)	Hard Tensile 25% (kN)	Soft Tensile 40% (kN)	Soft Tensile 30% (kN)	Soft Tensile 25% (kN)	Weight 40% (kg/km)	Weight 30% (kg/km)	Weight 25% (kg/km)	Resistance 40% (Ω/km)	Resistance 30% (Ω/km)	Resistance 25% (Ω/km)
7NO.8	9.5	58.59	29	30.6	31.6	15.5	16.3	16.9	482.1957	476.9226	473.4072	0.7433	0.991067	1.585707
7NO.7	10.5	73.85	36.5	38.5	39.9	19.6	20.6	21.3	607.7855	601.139	596.708	0.5849	0.779867	1.247787
7NO.6	12.1	93.10	46.1	48.6	50.3	24.7	26	26.8	766.213	757.834	752.248	0.4677	0.6236	0.99776
7NO.5	13.2	117.39	52.8	56	58.1	31.2	32.7	33.8	966.1197	955.5546	948.5112	0.3709	0.494533	0.791253
7NO.4	15.5	148.05	66.6	70.6	73.3	39.3	41.3	42.6	1218.4515	1205.127	1196.244	0.2941	0.392133	0.627413
7NO.3	17.1	186.69	84	89	92.4	49.6	52.1	53.8	1536.4587	1519.6566	1508.4552	0.2423	0.323067	0.516907

19-Strand Copper-Clad Steel Strand Data
Specification	Diameter (mm)	Area (mm²)	Hard Tensile 40% (kN)	Hard Tensile 30% (kN)	Hard Tensile 25% (kN)	Soft Tensile 40% (kN)	Soft Tensile 30% (kN)	Soft Tensile 25% (kN)	Weight 40% (kg/km)	Weight 30% (kg/km)	Weight 25% (kg/km)	Resistance 40% (Ω/km)	Resistance 30% (Ω/km)	Resistance 25% (Ω/km)
19NO.6	20.57	252.70	125	131.9	136.4	67.1	70.5	72.8	2079.721	2056.978	2041.816	0.173	0.230667	0.369067
19NO.5	23.1	318.63	143.4	152	157.7	84.6	88.9	91.8	2622.3249	2593.6482	2574.5304	0.1372	0.182933	0.292693
19NO.4	26.5	401.85	180.8	191.7	198.9	106.7	112.1	115.7	3307.2255	3271.059	3246.948	0.1095	0.146	0.2336
19NO.3	30.4	401.85*	228	241.7	250.8	134.5	141.4	145.9	4170.3879	4124.7822	4094.3784	0.0901	0.120133	0.192213

Note: The section area value for 19NO.3 is transcribed from the provided image as 401.85 and should be verified against the original specification sheet before publishing.

Copper-Clad Steel Wire for Electronic Products
Diameter (mm)	Section Area (mm²)	30HS Tensile Strength (MPa)	30A Tensile Strength (MPa)	40HS Tensile Strength (MPa)	40A Tensile Strength (MPa)	Minimum Elongation 30HS / 40HS (%)	Minimum Elongation 30A / 40A (%)
1.83	2.63	875	345	758	310	1.5	15
1.63	2.08	875	345	758	310	1.5	15
1.45	1.65	875	345	758	310	1.5	15
1.29	1.31	875	345	758	310	1.5	15
1.15	1.04	875	345	758	310	1.5	15
1.02	0.823	875	345	758	310	1.0	15
0.912	0.653	875	345	758	310	1.0	15
0.813	0.519	875	345	758	310	1.0	15
0.724	0.412	875	380	758	310	1.0	15
0.643	0.324	875	380	758	310	1.0	15
0.574	0.259	875	380	758	310	1.0	15
0.511	0.205	875	380	758	310	1.0	10
0.455	0.162	875	380	758	345	1.0	10
0.404	0.128	875	380	758	345	1.0	10
0.361	0.102	875	380	758	345	1.0	10
0.320	0.0804	875	380	758	345	1.0	10
0.287	0.0647	875	380	758	345	1.0	10
0.254	0.0507	875	380	758	345	1.0	10
0.226	0.0401	875	380	758	345	1.0	10
0.203	0.0342	875	380	758	345	1.0	10
0.180	0.0255	875	380	758	345	1.0	10
0.160	0.0201	875	380	758	345	1.0	10
0.142	0.0159	875	380	758	345	1.0	10
0.127	0.0127	875	380	758	345	1.0	10
0.114	0.0103	875	380	758	345	1.0	10
0.102	0.00811	875	380	758	345	1.0	10
0.089	0.00621	875	380	758	345	1.0	10
0.079	0.00487	875	380	758	345	1.0	10

Quality Control and Inspection

Grounding materials are often installed underground or exposed to outdoor environments for long periods. Once installed, replacement and repair can be costly. Therefore, pre-delivery inspection and quality control are important for engineering projects.

Henan Chalco can support copper layer surface inspection, copper thickness testing, bending tests, tensile strength tests, bonding tests, resistance testing, current-temperature cycle testing, freeze-thaw testing and neutral salt spray corrosion testing according to project requirements.

Inspection Item	Purpose
Copper layer surface inspection	Checks copper surface quality, coating continuity and visible defects.
Copper thickness testing	Verifies whether the copper layer meets project thickness requirements.
Bending test	Evaluates flexibility and copper-to-steel bonding during deformation.
Tensile strength test	Confirms mechanical strength for transportation, installation and service use.
Bonding test	Checks whether the copper layer and steel core remain firmly combined.
DC resistance testing	Confirms electrical resistance and conductivity performance.
Current-temperature cycle testing	Evaluates performance stability under current and temperature changes.
Freeze-thaw testing	Checks performance under low-temperature and temperature cycling environments.
Neutral salt spray corrosion testing	Evaluates corrosion resistance in humid or corrosive environments.

Typical Applications

Application Field	Typical Use
Coal chemical industry	Industrial grounding, anti-static grounding and lightning protection grounding
Petrochemical projects	Storage tank areas, pipe racks, equipment foundations and plant grounding grids
Rail transit	Station grounding, line grounding and power system grounding
Wind power projects	Wind turbine grounding, tower grounding and site grounding networks
Solar / PV power stations	PV bracket grounding, transformer grounding and solar farm grounding networks
Power and communication systems	Grounding electrodes, grounding conductors and equipotential bonding
Industrial facilities	Equipment protection grounding, lightning protection and safety grounding

How to Select the Right Copper-Clad Steel Grounding Product

Different projects have different grounding designs, soil conditions, corrosion levels, installation methods and electrical requirements. Product selection should not be based only on price or diameter. Conductivity, copper layer thickness, cross-sectional area, tensile strength, connection method and service environment should also be considered.

For large buried grounding grids, copper-clad steel round wire or strand wire can be selected. For equipment foundations, grounding down conductors and surface-mounted connections, copper-clad steel flat wire is more suitable. For vertical grounding electrodes and deep buried grounding systems, copper-clad steel grounding rods are commonly used. For offshore, coastal, high-humidity or corrosive environments, hot-dip tinned copper-clad steel flat wire or higher corrosion protection solutions can be considered.

Information Required for Quotation

Required Information	Details
Product type	Round wire, flat wire, grounding rod, strand wire, fine wire or welding tools
Size	Diameter, width, thickness, length or cross-sectional area
Conductivity	25%, 30%, 40% or other project requirement
Copper layer thickness	Minimum copper thickness or customized copper layer requirement
Material condition	Hard condition or annealed soft condition
Surface protection	Whether hot-dip tinning is required
Application environment	Soil condition, corrosion level, coastal/offshore environment or industrial site condition
Drawings and standards	Project drawings, technical specifications or grounding system standards
Quantity and delivery	Order quantity, packaging, labeling and delivery requirements

Choose Henan Chalco as Your Copper-Clad Steel Grounding Material Supplier

Henan Chalco supplies copper-clad steel round wire, strand wire, grounding rods, flat wire, hot-dip tinned flat wire, fine wire and matching exothermic welding accessories for lightning protection and grounding projects. With continuous casting technology, controlled copper thickness, multiple conductor structures and project-based customization, Henan Chalco helps customers improve grounding reliability while controlling total project cost.

Send us your drawings, specifications, application environment and quantity requirements. Henan Chalco can provide product selection support, technical confirmation and project quotation for copper-clad steel grounding materials.