We begin by deeply understanding your specific project requirements. Our expert team provides professional advice on material selection, specifications.
Color, Thickness, Spec, Quantity, Timeline. You Tell Us, We Document. The More Details, The Better The Match.
We send samples, or you send yours. We match, you approve. Until you say "That's it."
Zinc thickness, paint film, delivery dates, and pricing—everything is guaranteed in black and white.
Once your order is scheduled, we keep you posted: when it starts, when it's coated, when it's packed.
Final inspection before loading. Thickness, color, appearance — All good? Then it ships.
Test records kept for 3 years. You can access them anytime. Next order? We're here.
We operate a complete quality inspection system covering hot-dip galvanized steel, 55% Al-Zn alloy coated steel (Galvalume), and pre-painted steel sheet. From incoming raw materials to finished product dispatch, we implement a five-stage control process to ensure stable performance, excellent surface quality, and full traceability.
Substrate surface/dimensions, zinc/Al-Zn ingot composition, paint/passivation batch & concentration – non-conforming materials are rejected immediately.
Annealing furnace atmosphere, zinc bath temperature, air knife parameters, curing oven temperature – both equipment and parameters must meet specifications.
Sampled per coil / every 2 hours: coating thickness, spangle, flatness, T-bend, hardness, MEK rub – any deviation triggers instant feedback and, if necessary, line stoppage.
Appearance, dimensions, mechanical properties, corrosion resistance, coating adhesion – a quality certificate is issued for every batch.
Moisture-proof wrapping, steel strapping, label verification, random re-inspection – non-conforming products are never released.
All instruments are regularly calibrated to ensure accurate and reliable data.
For specific inspection frequencies, defect acceptance criteria, calibration requirements, etc., please click below:
Continuous/intermittent line mark, width <5 mm
Scratch, black streak, bare line, coating scratch
Minor: 3%–5% credit
Severe: 15%–50% credit
Local spot/patch, diameter/side <50 mm
Zinc dot, bare spot, black stain, blister, pinhole
Single spot: no compensation
Dense (>5/m²): 5%–15% credit
Defect area ≥0.1 m², affecting appearance/use
Large-area peeling, rust patch, large bare area
Proportional to area × factor
Severe: 50%–80% credit
Measured performance below standard/contract
Low coating weight, poor adhesion, salt spray failure
50%–80% credit + processing loss
Critical: refund + 10% penalty
For specific inspection frequencies, defect acceptance criteria, calibration requirements, etc., please click below:
With 20 years of deep expertise in the steel industry, CONBYTH upholds its core value of "CONSTANTLY BY TRUTH," always prioritizing integrity and authenticity as the foundation of its business.
Committed to providing cost-effective steel solutions and integrated full-chain services, Changbai strictly controls every stage from production to final delivery, ensuring the stability of its products and services. Its products are exported to dozens of countries and regions worldwide, earning long-term trust from domestic and international clients through exceptional quality and honest service.
CONBYTH is both a manufacturer and trading company. We have our own production facilities with four production lines, and we also trade high-quality steel products from trusted partners to meet diverse customer needs.
Our factory is located in Boxing County, Binzhou City, Shandong Province, China. This region is known for its steel industry cluster and convenient transportation access.
We use advanced coating technology and strict color management systems to ensure batch-to-batch color consistency. Our quality control includes spectrophotometer testing and visual inspection.
Our galvalume steel coils meet international standards with excellent corrosion resistance and long service life. Each batch undergoes rigorous testing for coating thickness, adhesion, and surface quality.
We have a comprehensive quality management system in place. In case of any quality issues, we provide prompt investigation, documentation, and resolution. Our return claim policy ensures fair compensation when necessary.
Our products are exported to dozens of countries and regions worldwide, including Southeast Asia, Middle East, Africa, Europe, and South America. We have established long-term partnerships with clients in over 50 countries.
