In fields such as decoration, furniture, and industrial equipment,Colored stainless steel plates have become a popular choice due to their high appearance level and corrosion resistance. However, the quality of products in the market varies greatlyThe quality of merchants varies greatly. How can one avoid it The traps of "passing off inferior goods as good ones" and "cutting corners"? This article will provide you with a professional-level purchasing guide from two aspects: key points of procurement and screening merchants.

1. For the purchase of colored stainless steel platesFive core points to note

(1) Clarify requirements: Work backward from the purpose to determine the core indicators

· Decorate the sceneIf it is used for hotel lobbies, kitchen and bathroom decoration, etc., special attention should be paidColor uniformity(Avoid the appearance of Yin and Yang sides)Surface glossWhether the mirror finish, matte finish and other processes meet the standards andAnti-fingerprint performanceIs there any thickness of the fingerprint-free oil film≥3μm）。

· Industrial sceneIt is used for chemical equipment, outdoor curtain walls, etc., and should be given priority for investigationCorrosion resistance gradeSalt spray test≥48 hoursHardness indexVickers hardnessHV≥200) andHigh-temperature resistance performanceHeat resistance after hard film treatment≥200℃）。

· Pitfall avoidance reminderBe cautious of use by merchants The concept of "general type" is ambiguous. It is essential to provide a "Material Inspection Report" to verify the nickel and chromium content (for 304 stainless steel, the nickel content should be ≥8% and the chromium content ≥18%).

(2) Visual identification:Detect surface defects in 3 seconds

· Look at the color differenceWhen observing the entire board under natural light, the color transition should be uniform without any faults. After taking pictures with a mobile phone and magnifying to compare the edge and the center area, it is allowed ΔE (color difference value) ≤1.5. If it exceeds 2, it is considered unqualified.

· Feel the textureWhen the surface is lightly scratched with fingers, the high-quality board feels as smooth as a mirror, without any grainy sensation. If there are slight protrusions, it may be due to uneven passivation film or incomplete hard film treatment.

· Measure adhesion: UseAfter applying the 3M tape to the surface, quickly remove it and observe if there is any film peeling off. If there is no fingerprint, the adhesion of the oil film needs to be tested by the hundred-grid method (the peeling area after scratching the grid should be ≤5%).

(3) Verification Process: See the essence through parameters

· Coloring processThe thickness of the oxide film required by the acidic bath oxidation methodFor the process of ≥0.1μm, the merchant can be requested to provide the coloring time record (for example, the immersion time of titanium gold plate should be ≥20 minutes), and for the vacuum titanium plating process, the coating thickness (≥0.3μm) needs to be confirmed.

· Protective film sprayingAsk about the paint brand (recommended for use)For products from major manufacturers such as PPG and Nippon Paint, qualified fingerprint-free films should have an anti-fingerprint test report (after writing with an oil-based pen and wiping, the residual mark should be ≤10%).

· Practical operation suggestionsRequest a small sample for a boiling test (boiling in boiling water)Within 30 minutes, high-quality boards should not show signs of fading or bubbling.

(4) Contract Details: Use terms to lock in liability

· Quality clauseMake a clear agreement If the inspection is not qualified, the buyer has the right to return the goods unconditionally and claim three times the payment for the goods. Attached is the "Annex to the Quality Acceptance Standard" (refer to GB/T 18705-2002).

· Delivery termsRequirement "Batch acceptance" (pre-acceptance before leaving the factory + random inspection upon arrival), during transportation, double-layer packaging of wooden crates and pearl cotton is adopted, and the damage rate should be ≤0.5%.

· After-sales termsNote "Lifetime free surface maintenance technical guidance is provided." If discoloration or delamination issues occur within the shelf life (recommended ≥2 years), the merchant must provide on-site handling within 48 hours.

(V) Cost Control: Be vigilant against low-price traps

· Price logic:Take 1.0mm thick 304 colored stainless steel plates as an example. The normal market price is between 200 and 300 yuan per square meter. Products priced below 150 yuan per square meter are highly likely to have material counterfeiting (such as passing off 201 stainless steel as 304) or process degradation (omits hard film treatment).

· Implicit costLow-priced boards may be due to poor corrosion resistanceIt needs to be replaced every 2 to 3 years, and the overall cost is actually higher than that of high-quality boards. It is recommended to adopt the "life cycle cost method" to calculate the maintenance and replacement costs within five years.

Second, those seeking high-quality merchantsThe Four Golden Rules

(1) Qualification screening: Exclusion "Three-no" manufacturers

· Essential documentsBusiness license (Business scope includes. "Stainless steel processing", ISO9001 quality management system certification, environmental management system certification (environmental impact assessment approval is required for electroplating processes).

· Industry thresholdPriority is given to establishmentEnterprises with over five years of experience and those with an annual production capacity of no less than 5,000 tons have better guarantees for process stability.

(2) On-site inspection: Seeing is believingThree key points

· Look at the production lineHigh-quality manufacturers should be equipped with fully automatic coloring production lines (such as continuous electroplating tanks), film thickness detectors, salt spray testing machines and other equipment. Small workshop-style manual operations are difficult to guarantee quality.

· Check warehouse managementFinished boards should be stored upright in a warehouse with constant temperature and humidity to avoid surface damage caused by flat placement. The packaging labels should clearly indicate information such as material, color, and batch.

· Case of visiting customersIt is required to visit cases of the same type of project (for example, in hotel projects, the completed lobby decorative panels can be inspected) and observe their usageWhether the boards that have been used for more than three years show problems such as fading and corrosion.

(3) Word-of-mouth Verification: Multi-dimensional assessment of credibility

· Online channelOn Alibaba, Hc360.com, etcOn B2B platforms, check the merchant's "Transaction Medal" (≥4 stars is preferred) and buyer reviews (with a focus on "Description consistency" ≥4.8 points).

· Industry recommendationConsult professional institutions such as the Stainless Steel Association and the Architects Association for information "Recommended Supplier List", such merchants are usually certified by industry standards.

· Sample testingRequest to provideThree samples from different batches were entrusted to a third-party testing institution (such as SGS, National Metal Materials Quality Inspection and Testing Center) for full-item testing. Only after passing the test can they be included in the candidate list.

(4) Cooperative Exploration: From small orders to long-term win-win results

· Trial order strategyThe initial purchase quantity should be controlled atFor an area of 50-100 square meters, the key inspection points include the delivery cycle (qualified within ±3 days of the promised time), packaging protection (no scratches on the surface of the board after opening the box), and the documents accompanying the goods (complete quality inspection reports and material certificates).

· Long-term cooperation: Establish The "Supplier Performance Scoring Sheet" is evaluated monthly from three dimensions: quality (40%), delivery time (30%), and service (30%). Those who score 85 or above can be upgraded to strategic partners.

Iii. Case Analysis of Avoiding Pitfalls in Procurement

CaseoneA certain decoration company is purchasing at a low price The "rose gold board" turned black over a large area three months after installation. After testing, the material is 201 stainless steel (with nickel content of only 1.2%), and no hard film treatment has been carried out. The thickness of the oxide film is less than 0.05μm.

LessonFailing to check the material report and blindly trusting the merchant The excuse of "high cost performance".

Case2A certain industrial enterprise has chosen to possessIso-certified manufacturers are required to provide salt spray test reports for each batch (5% sodium chloride solution, no corrosion after 24 hours of spraying), and have never had any quality problems in the past five years of cooperation.

ExperienceLock the quality bottom line with standardized testing procedures.

The purchase of colored stainless steel plates is not It's as simple as "buying cheap" or "buying expensive". Instead, it requires professional knowledge to break down demands, scientific methods to verify quality, and systematic thinking to screen merchants. Through the "5-step procurement method" and "4 major screening rules" in this article, not only can we avoid falling into the trap of inferior products, but also establish long-term and stable cooperative relationships with high-quality merchants, making every purchase a "value investment" rather than a "risk game".