Tianjin Tianyingtai Steel Pipe Co., Ltd. is one of the most credible manufacturers and suppliers of thick wall thickness black annealed pipe in China. Welcome to consult the quotation and import cheap thick wall thickness black annealed pipe made in China here from our factory.
Thick-walled black annealed steel pipe is a carbon steel pipeline manufactured through cold rolling or cold drawing followed by annealing treatment. It combines high wall thickness design (typically ≥5mm) with annealed-state flexibility, retaining a black oxide scale surface. Ideal for industrial applications requiring a balance of strength and machinability.
1. Material & Manufacturing Process
Material: ASTM A106/API 5L Gr.B or equivalent carbon steel (tensile strength ≥415MPa).
Annealing Process: Slow cooling to eliminate internal stress, reducing hardness to HRB≤80 for improved stamping/welding performance.
2. Structural Advantages
Thick-Wall Design: Wall thickness range: 5mm–40mm; pressure capacity up to 20MPa (varies by specification).
Surface Condition: Unpickled black surface reduces costs, suitable for non-aesthetic priority projects (e.g., concealed engineering).
3. Dimensional Flexibility
Outer Diameter: Φ50mm–Φ600mm (custom non-standard sizes available with ±1% tolerance).
Length: Fixed lengths (6m–12m) or continuous coiled pipes (requires prior agreement).
| Name | Black Square Pipe Thin Wall Thickness |
| Surface | Galvanized (40-60g/m2 usual,can be request by customer) |
| Material | Q195,Q215,Q235 |
| MOQ | 5 tons for normal size and material |
| WT | 0.6-2.2mm |
| Payment terms | TT deposit +BL copy / LC or 100% LC at sight |
| Trade terms | FOB,C&F,CIF,EXW |
| Length | fixed or random,as customer request. |
| End Treatment | Plain(can be threaded,punch,shrink,extension... ) |
| Lead time |
within 7 days from stock with 6m length (stock pipe with our factory name in Chinese),20-25 days for customized pipe according to the qty |
Product Chemical Composition & Mechanical Properties :
| Grade | Chemical Composition | Mechanical Properties | ||||||
| C | Mn | Si | S | P | Yield | Tensile | Elongati | |
| Strength Mpa | Strenth Mpa | -on % | ||||||
| Q195 | 0.06-0.12 | 0.25-0.50 | ≤0.30 | ≤0.045 | ≤0.05 | ≥195 | 315-430 | ≥33 |
| Q215 | 0.09-0.15 | 0.25-0.55 | ≤0.30 | ≤0.05 | ≤0.045 | ≥215 | 335-450 | ≥27 |
| Q235 | 0.12-0.20 | 0.30-0.67 | ≤0.30 | ≤0.045 | ≤0.04 | ≥235 | 375-500 | ≥26 |
| Q345 | ≤0.20 | 1.00-1.60 | ≤0.55 | ≤0.04 | ≤0.04 | ≥345 | 470-630 | ≥22 |
.Product standard test:
| Q195 ≈ | Grade B,SS330 SPHC,S185 |
| Q215 ≈ | Grade C/CS Type B,SS330 SPHC |
| Q235 ≈ | Grade D,SS400,S235 |
| Q345 ≈ | Grade 50/345,SPFC590,E/S335 |
Quality Inspection:
1.Certified Testing Center
Our factory operates a CNAS-accredited laboratory (the 2nd private enterprise to achieve this certification).
2.Strict Quality Control
Dual-check system:
✓ First pass: In-line production inspection
✓ Second pass: 100% finished product quality audit
3.International Certifications
Holds ISO, CE, LR, and Philippine certifications.
Supports third-party tests (e.g., SGS, BV) upon request.
Packing&Shipment:
1.we have fully enclosed, clean and tidy modern logistics storage center with a building area of 20,000 square meters. It can provide customers with storage, package, billing and delivery. We can loading 20-25 containers one day. The packing accuracy rate is 100%;
2.We own professional logistics shipment, around more than 10 13-meter semi-trailers, in terms of transport efficiency and quality to provide customers with convenience, cost reduction, value-added services;
3.In the aspects of preventing steel pipe bumping, scratching, cratering, flattening, pipe deformation, raining, etc., standardization operations have been established and strictly implemented to ensure that the quality of the process of storage and transportation of steel pipes is effectively controlled.
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