• Jiangsu Hongbao Group Co., Ltd.
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  • Jiangsu Hongbao Group Co., Ltd.
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Phone Number : 86-512-58715276
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High Precision Seamless Tubing 30mm Inner Diameter For Metal Processing

Place of Origin Jiangsu, China
Brand Name Hongbao
Certification TS16949,DNV,PED,ISO
Model Number HBPST-1
Minimum Order Quantity 1 ton
Price Negotiable
Packaging Details seaworthy plywooden case packing.
Delivery Time Within 50 days if production
Supply Ability 30000MT per year

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Product Details
Material ST37.4,ST52.4,E235,E355,26MnB5,34MnB5 Brand Hongbao
Certificate TS16949,DNV,PED,ISO Origin Jiangsu,China
OD 6-120mm Thickness 0.5-15mm
Type Welded Or Seamless Processing Cold Drawn, Cold Rolled
High Light

precision seamless tubing


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Product Description

High Precision Welded Carbon Steel Tube DIN2391 E235 E355 Precision Steel Tube For Brake Pipes


Tolerance in Dimension:

OD GB/T3639(GB8713) DIN2391(EN10305) Our Tolerence Best Quality
4-30mm ±0.10mm ±0.08mm ±0.05mm ±0.02mm
31-40mm ±0.15mm ±0.15mm ±0.05mm ±0.03mm
41-50mm ±0.20mm ±0.20mm ±0.05mm ±0.03mm
51-60mm ±0.25mm ±0.25mm ±0.08mm ±0.03mm
61-70mm ±0.30mm ±0.30mm ±0.10mm ±0.05mm
71-160mm ±0.30mm ±0.30mm ±0.10mm ±0.05mm
Tolerance in WT ±0.12mm ±0.10mm ±0.05mm ±0.03mm
Process Diameter Length Precision Inner Hole Roughness
Cold Rolled 30-100mm ≤12 m H8-H10 0.4-1.6
Cold Draw 30-250mm ≤12 m H8-H10 0.8-1.6
Honing 40-500mm ≤12 m H8-H9 0.4-0.8
Rolling 40-400mm ≤7 m H8 0.4
Inner Diameter H8 H9 H10  
30mm ±0.033 ±0.052 ±0.084 5-30mm
30-50mm ±0.039 ±0.062 ±0.100 ±0.080
50-80mm ±0.046 ±0.074 ±0.120  
80-120mm ±0.054 ±0.087 ±0.140  
120-180mm ±0.063 ±0.100 ±0.160  
180-250mm ±0.072 ±0.115 ±0.185  
250-315mm ±0.081 ±0.130 ±0.210  
315-400mm ±0.089 ±0.140 ±0.230  




























1. 100% PMI,Spectro Chemical Aanlysis Test for Raw Material
2. 100% Dimension & Visual Examination
3.  Mechanical Properties Test Include Tension Test,Flaring Test (For Seamless tube/pipe)/ Flange Test (For Welded Pipe & Tube), Hardness Test ,Reversed Flattening Test
4. 100% Hydrostatic Test or 100% NON-DESTRUCTIVE Test (ET or UT)








Material grade:10#~45#, 16Mn, ST35~ST52

Length:as customer’s need

Standard: DIN2391, EN10305, GB/T3639, GB8713

Application: hydraulic cylinder, automobile

Heat Treatment: according to the customer’s need

Delivery time : 30days more or according to the customer’s acquirement



1. bundle packing

2. marking as per customer's requests

3. paint on the pipe as per customer request

4. pipe caps as customer reque


High Precision Seamless Tubing 30mm Inner Diameter For Metal Processing 0