SGS Inspection Report

Jinan Haoyang Forging and Casting Co., Ltd.

Forged Steel Ball Inspection Report

Report Number: HY-JC-20251109-01

Client: Jinan Haoyang Forging and Casting Co., Ltd. (International Trade Department)

Inspected Party: A European Mining Equipment Integrator (North Rhine-Westphalia, Germany)

Inspection Purpose: To verify whether the 100mm specification forged steel balls comply with the "Annual Forged Steel Ball Supply Agreement" (Contract Number: HY-OUT-20251108) and relevant standards.

Inspection Date: November 7th - 8th, 2025

Inspection Location: Jinan Haoyang Forging and Casting Quality Inspection Center (within the production base in Zhangqiu, Shandong)

I. Sample Information Please provide the text you would like translated.

Sample Name: 100mm Forged Steel Ball

Material Model: High Carbon Manganese Alloy Steel (B3)

Sampling Batch: 20251106-B3-08

Sample quantity: 20 pieces (including 12 pieces for testing loss)

Production date: November 6, 2025

Sample condition: No rust or cracks on the surface, complete appearance Please provide the text you would like translated.

II. Inspection Basis

Article 4.2 of the "Annual Supply Agreement for Forged Steel Balls" (HY-OUT-20251108) signed by both parties, which stipulates the technical requirements for the products. Please provide the text you would like translated.

National Standard GB/T 17445-2019 "Forged Steel Balls" Please provide the text you would like translated.

The limit requirements for hazardous substances stipulated in Annex XVII of the EU REACH Regulation (EC No. 1907/2006); Please provide the text you would like translated.

Enterprise Standard Q/JHY 003-2024 "Technical Specification for Forged Steel Balls for Mining" Please provide the text you would like translated.

III. Test Items, Methods and Results Please provide the text you would like translated.

Test Item

Test Method

Contract Requirements / Standard Limits

Test Result

Judgment Result

1. Surface Hardness (HRC)

GB/T 230.1-2018 "Metallic Materials - Rockwell Hardness Test - Part 1: Test Method" 60-63HRC

Five samples were randomly inspected, with an average hardness of 61.8 HRC (range: 60.5 - 62.3 HRC). 

Passed.

2. Impact toughness (J/cm²)

GB/T 229-2020 "Test Method for Charpy Impact Toughness of Metallic Materials" ≥16J/cm²

Three samples were randomly inspected, with an average value of 17.2 J/cm² (range: 16.5 - 18.0 J/cm²). Passed.

3. Chemical composition (mass fraction)

GB/T 4336-2016 "Determination of multi-element content in carbon steel and low alloy steel - Spark discharge atomic emission spectrometry (conventional method)"

C: 0.6% - 1% Please provide the text you would like translated.

Manganese (Mn): 0.8% - 1% Please provide the text you would like translated.

Si: 0.40% - 0.80%; P ≤ 0.035%; S ≤ 0.030%

C: 0.8%; Mn: 0.95%; Si: 0.62%; P: 0.028%; S: 0.022%

Qualified

4. Appearance and Dimensional Tolerance

GB/T 17445-2019 Appendix A; Measured with calipers (accuracy 0.01mm)

Diameter tolerance: ±0.5mm; Surface free of cracks, inclusions, and pores

Sampled and inspected 10 pieces, diameter range 99.6 - 100.3mm; Surface free of defects

Qualified

5. Wear Resistance (Loss Rate)

GB/T 17445-2019 Appendix C (Laboratory simulated ball mill grinding test)

Continuous grinding for 300 hours, loss rate ≤ 2%

Post-test loss rate 1.78%

Qualified Please provide the text you would like translated.

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IV. Inspection Conclusion

The 100mm specification forged steel balls (batch 20251106-B3-08) from Jinan Haoyang Forging and Casting submitted for inspection have been tested for appearance, size, hardness, impact toughness, chemical composition, wear resistance, and REACH hazardous substances. All the indicators meet the requirements of the "Annual Forged Steel Ball Supply Agreement" (HY-OUT-20251108), GB/T 17445-2019, and the EU REACH regulations. Therefore, they are determined to be qualified products. Please provide the text you would like translated.