What Are the Surface Quality Requirements for Steel Parts?
Sep 10, 2025
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Steel parts are various components made from steel and are widely used in fields such as machinery, automotive, aerospace, and construction. The surface quality of steel parts has the following main requirements:
Surface Smoothness: The surface of steel parts should have sufficient smoothness and should be free from defects such as cracks, bubbles, scars, folds, and embedded iron oxide scale. These defects may adversely affect the performance and service life of the parts.
Allowable Defects: Provided they do not affect the usability of the parts, the surface of steel parts may have thin layers of iron oxide scale, rust, insignificant surface roughness caused by the detachment of embedded iron oxide scale, indentations, and other local defects that do not hinder inspection. However, the depth of these defects should not exceed half of the thickness tolerance, and the minimum allowable thickness of the steel must be ensured.
Treatment of Harmful Defects: If harmful defects exist on the surface of steel parts, they should be removed. The cleaned surface should be smooth and free of sharp edges, and the minimum allowable thickness of the steel must be ensured.
Please note that the above information represents general requirements. Specific requirements may vary depending on the application field, working conditions, and design specifications of the steel parts. Therefore, in actual production processes, the surface quality requirements for steel parts must be determined based on specific circumstances.
Titanium product forms available from GNEE
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Item Name |
china wholesale stock astm b337 b338 gr1 gr2 gr9 titanium pipe titanium tubes seamless |
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Material |
pure titanium and titanium alloy |
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Standard |
ASTM B337, ASTM B338. ASTM B861, ASTM B862 |
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Brand |
China Grades: TA1, TA2, TC4 (Gr5 Equivalent), TA9 (Gr7 Equivalent), TA10 (Gr9 Equivalent), TA18 |
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Shape |
Round Titanium Tube/Pipe, Square Titanium Tube/Pipe, Rectangular Titanium Tube/Pipe, Titanium Coil Tube |
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Type |
Seamless & Welded (ASTM B337/B338 for Industrial & Heat Exchanger Applications) |
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Product name |
Pure Titanium bar/Pure Titanium rod/Titanium alloy bar/Tianium alloy rod |
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Standard |
GB/T 2965-2007 GB/T 13810-2007, ASTM B348,ASTM F67,ASTM F136, AMS4928,MIL4911 |
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Titanium type |
Commercially Pure(CP) / Titanium alloy |
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Grade |
TA1 TA2 TA3 TA4 TA5 TA6 TA7 TA8 TA9 TA10 TA11 TA12 TA13 TA14 |
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Diameter |
3-350mm |
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Length |
Max6000mm |
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Technique |
Forging, machining |
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Surface |
Acid surface or polishing, sand blasted surface |
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Shape |
Round, flat, square, hexagonal |
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Application |
Metallurgy, electronics, medical, chemical, petroleum, pharmaceutical, aerospace, etc. |
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Production Name |
Titanium plate/Titanium sheet |
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Grade |
Gr1, Gr2, Gr3,Gr4,Gr5, Gr7, Gr6,Gr9, Gr11, Gr12 ,Gr16, Gr17,Gr25 |
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Size |
All sizes can be customized |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technology |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Delivery time |
10-25days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Product name |
Titanium wire |
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Grade |
GR1,GR2,GR3,GR4,GR5,GR7,GR9,GR11,GR12,GR23 etc.
ERTi-1, ERTi-2, ERTi-3, ERTi-4, ERTi-5, ERTi-7, ERTi-9, ERTi-11, ERTi-12 |
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Size |
Dia：0.1-8mm or customizable |
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Standard |
ASTM B348,ASME SB348,ASTM B863,AWS.A5.16,GB/T3623-2007 |
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MOQ |
10kg |
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Quality and test |
Annealing, Ultrasonic testing |
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Application |
Aerospace, Chemical, Medical, Eye Frames,Welding etc |
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Feature |
High strength,Light weight,Excellent heat conduction and corrosion resistance |
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Condition |
Annealed (M), Hot Worked (R), Cold Worked (Y) |
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Surface |
Bright, Polished, Pickling, Sandblasting |
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Package |
Wooden Box |
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Product Name
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Custom Precision CNC Machining Services
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Material
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Metal: Aluminum, Stainless Steel, Copper, Iron, Titanium Alloy, Zinc Alloy, Magnesium Alloy.
Plastic: Nylon, ABS, POM, PC, PP, PE, PETG, PEEK, PMMA, PVC, UHMW.
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Surface treatment
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Anodizing, Polishing, Electroplating, Powder Coating, Sandblasting, Magnetic Polishing, Spray Painting, Drawing, Embossing, Electrophoresis, Screen Printing, Laser Engraving.
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Process
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3-Axis/4-Axis/5-Axis/6-Axis CNC Milling, CNC Turning
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Application
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Mechanical Spare Parts, Aerospace Components, Automotive Parts, Maintenance Parts
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Maximal Part Size
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3000 mm (118 in)
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Minimal Part Size
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2 mm (0.08 in)
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Drawing format
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DWG, DXF, PDF, SOLIDWORKS, PRT, STP, STEP, IGS, etc.
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Certification
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ISO 9001:2015
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GNEE is a specialized manufacturer and exporter of high-quality titanium products, including pipes, sheets, bars, wires, and fabricated parts.
We utilize advanced CNC machining, rolling, and welding equipment to ensure precision manufacturing. All products undergo strict chemical, mechanical, and non-destructive testing to guarantee compliance with international standards.
Our export-safe packaging includes wooden crates and waterproof wrapping to ensure secure delivery. If you have any needs, please feel free to contact us immediately：info@gneemetal.com
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