Quality Control Reports | Daehan Instrument Co., Ltd.

🎯 Project-Specific Quality Inspection Services

Application-Specific Quality Inspection Program

We selectively apply quality inspection items based on each project's characteristics and requirements. From standard inspections to advanced special tests, we provide optimized inspection packages tailored to customer needs.

Inspection Selection Principles:
• Basic Package: Dimensional, material, and pressure tests (mandatory for all projects)
• Standard Package: Basic + penetrant testing, tensile test (general industrial use)
• Advanced Package: Standard + eddy current, impact test, chemical analysis (high pressure/temperature applications)
• Premium Package: Complete + macroetch, 3.1 Certificate (nuclear/petrochemical industries)

Project-Tailored Selective Application Optimized

Quality Inspection Confirmation Process at Quotation Stage

During quotation requests, we comprehensively analyze project specifications, application environment, and customer requirements to propose the optimal quality inspection combination. Final inspection items and costs are determined through consultation with customers at the quotation confirmation stage.

Confirmation Procedure:
1️⃣ Initial Consultation: Understand project overview and basic requirements
2️⃣ Technical Review: Analyze fluid characteristics, operating conditions, safety class
3️⃣ Inspection Proposal: Present recommended inspection items and optional choices
4️⃣ Cost Estimation: Provide detailed costs per inspection and total amount
5️⃣ Final Confirmation: Determine inspection package based on customer selection

Confirmed at Quotation Technical Review Consultative Decision

Customer Choice & Cost Transparency

All quality inspections are performed based on the customer's final choice, and we transparently disclose costs for each inspection item. While manufacturers provide recommendations from a technical perspective, the final decision rests with the customer.

Selection & Cost Principles:
• Customer Choice: All inspection items can be selected/omitted at customer discretion
• Technical Advisory: Inspection item recommendation service based on project characteristics
• Cost Transparency: Pre-disclosure of unit prices and total costs per inspection
• Flexible Adjustment: Inspection items can be added/modified during project progress

Customer Choice Cost Transparent Flexible Adjustment

Project-Specific Inspection Recommendation Guidelines

Based on 35 years of experience, we propose quality inspection combinations optimized for each industry sector and application environment.

Recommended Inspections by Industry:
🏭 General Industry: Basic + penetrant testing + tensile test
🔥 High Temperature/Pressure: Standard + impact test + chemical analysis
⚛️ Nuclear/Petrochemical: Complete inspection + 3.1 Certificate
🌊 Marine/Corrosive Environment: Standard + eddy current + corrosion resistance test
🏗️ Construction/Plant: Basic + pressure test + enhanced dimensional inspection

Industry-Specific 35 Years Experience Expert Recommendations

🇰🇷 Korean Quality Excellence

Quality assurance optimized for field applications using POSCO Premium Stainless Steel

35 years of accumulated Korean technology × Perfect compliance with ISO 5167 international standards

🔍 1. Non-Destructive Testing (NDT)

Liquid Penetrant Test

Precision inspection for detecting surface defects, identifying microscopic cracks or porosity that are difficult to see with the naked eye.

Applied Standards: ASME Sec.V, ASTM E165, KS B 0816
Inspection Scope: Weld zones, base metal, all machined surfaces
Acceptance Criteria: Level 2 or higher defect-free determination

Surface Defect Detection Crack Detection Porosity Discovery

Eddy Current Test

High-precision inspection using electromagnetic induction to detect defects inside and on the surface of materials in a non-contact manner.

Applied Standards: ASTM E309, ASME Sec.V
Inspection Target: Stainless steel tubes, plates
Detection Capability: Defect detection of 0.1mm or larger

Internal Defect Detection Non-Contact Inspection High-Precision Analysis

Macroetch Test

Observation of weld zone microstructure through chemical etching to detect weld quality and material abnormalities.

Applied Standards: ASTM E381, ASME Sec.IX
Inspection Area: Weld cross-section, heat-affected zone
Evaluation Items: Penetration depth, porosity, undercut, cracks

Microstructure Observation Weld Zone Evaluation ASTM E381

🧪 2. Mechanical Properties Test

Tensile Test

Measures yield strength, tensile strength, and elongation to evaluate mechanical properties of materials.

Applied Standards: ASTM A370, KS B 0802
Test Specimen: Round or flat test specimens
Measurement Items: Yield strength ≥ 205MPa, Tensile strength ≥ 515MPa, Elongation ≥ 40%

Yield Strength Tensile Strength Elongation

Bend Test

Essential test to evaluate ductility and soundness of weld zones.

Applied Standards: ASME Sec.IX, ASTM A370
Bending Angle: 180° complete bending
Acceptance Criteria: No cracks or defects

Ductility Evaluation Weld Soundness 180° Bend

Hardness Test

Test to confirm surface strength and wear resistance of materials.

Applied Standards: ASTM E18 (Rockwell), ASTM E384 (Vickers)
Measurement Areas: Base metal, weld zone, heat-affected zone
Reference Values: HRB ≤ 95, HV ≤ 200

Surface Strength Wear Resistance Rockwell/Vickers

Impact Test

Evaluates impact toughness at low temperatures to confirm brittle fracture resistance.

Applied Standards: ASTM E23, KS B 0809
Test Temperature: -196°C ~ +20°C
Reference Value: 27J or higher (Charpy V-notch)

Impact Toughness Low-Temperature Properties Charpy Test

Flattening Test

Dedicated test to confirm compression and deformation durability of tubes.

Applied Standards: ASTM A370, ASME SA-213
Compression Rate: 5-10% of outer diameter
Acceptance Criteria: No crack formation

Compression Durability Deformation Resistance Tube-Specific

⚗️ 3. Chemical Composition Analysis

Elemental Analysis

Precision analysis of chemical composition of POSCO Premium Stainless Steel to verify material suitability.

Analysis Elements: C, Si, Mn, P, S, Ni, Cr, Mo, N, Cu
Applied Standards: ASTM A193-B8M, A194-8M, TP316/316L
Analysis Method: ICP-AES, Combustion method (C, S, N)
Precision: ±0.001% (carbon), ±0.01% (other elements)

C ≤ 0.08% Ni 10-14% Cr 16-18% Mo 2-3%

316/316L Stainless Steel Certification

Premium stainless steel material certification required by ISO 5167 standards.

Grade 316: Excellent corrosion resistance, outstanding high-temperature strength
Grade 316L: Ultra-low carbon, highest intergranular corrosion resistance
Applications: Orifice plates, Venturi tubes, Flow nozzles

Corrosion Resistance High-Temp Strength Intergranular Corrosion Resistance

📑 4. Quality Assurance / Certification Reports

CMTR (Certified Material Test Report)

Comprehensive material certificate including chemical composition, mechanical properties, and non-destructive test results

Mill Sheet

CoC (Certificate of Compliance)

Certificate of compliance with ISO 5167, ASME, KS standards

Standards Compliance

CoT (Certificate of Test)

Test results and pass judgment by lot
(Report No: KS0226-01 format)

Test Report

3.1 Certificate

EN 10204-3.1 European standard material certificate

European Certification

Lot Traceability Management

Systematic quality management enabling history tracking from raw materials to finished products throughout all processes

Tracking Number: Year-Month-Day-Lot Number (e.g., 2025-08-17-001)
Management Items: Raw material receipt → Processing → Inspection → Shipment
Retention Period: 10 years of electronic document storage

History Tracking Full Process Management 10-Year Storage

🏆 Korean Quality Assurance Excellence

35 years of accumulated Korean technology exported to over 40 countries worldwide

POSCO Steel + Perfect ISO 5167 compliance = World-class quality

"Practical Flow Solutions since 1989"

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