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Zhangjiagang Huadian Import & Export Co., Ltd.
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wide application 30CrMo seamless mechanical tube
The structure of Jiangsu Dehai Group:
Zhangjiagang Huagang Industrial Co., Ltd.——Tube manufacturer
Zhangjiagang Huadian Power Equipment Co., Ltd.——Boiler parts manufacturer
Zhangjiagang Huadian Import & Export Co., Ltd.——Trading company for tubes and boiler parts
The strength products of Zhangjiagang Huagang Industrial Co., Ltd. are in the table below:
Standards | Description | Common Steel grades |
ASTM A179 | Seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes | A179 |
ASTM A192 | Seamless carbon steel boiler tubes for high-pressure services | A192 |
ASTM A210 | Seamless medium-carbon steel boiler and superheater tubes | Grade A-1, Grade C |
ASTM A519 | Seamless carbon and alloy steel mechanical tubing | MT1010,MT1015,MT1020, 1008, 1010, 1020, 1035, 1045, 4130, 4140 |
EN10305-1 | Seamless cold drawn tubes | E215, E235, E355 |
EN10305-4 | Seamless cold drawn tubes for hydraulic and pneumatic power systems | E215, E235, E355 |
DIN 2391 | Seamless precision steel tubes | St35, st45, st52, st37.4 |
DIN 17175 | Seamless tubes of heat-resistant steels | St35.8, 15Mo3 |
GB/T 3639 | Seamless cold-drawn or cold-rolled steel tubes for precision application | 10#, 20#, 45#, Q345B |
GB/T 8163 | Seamless steel tubes for liquid services | 10#, 20#, Q345B, 16Mn |
GB 9948 | Seamless steel tubes for petroleum cracking | 10#, 20# |
GB 3087 | Seamless steel tubes for low and medium pressure boiler | 10#, 20# |
Seamless precision steel tubes are used variously:
• equipment engineering
• elevator tubes
• gas cylinders
• pit props
• hydraulic lines
• chain pipes
• bicycle/ motorcycle frames
• rivets
• pumps
• technical machinery
• cylinder, piston and telescopic tubes
• stabiliser tubes
• gear box tubes
• drive shaft tubes
Tubes for automotive industry:
• axles for gearboxes
• fuel injection lines
• piston bolts
• ball cages
• steering wheel shafts column tubes
• power-assisted steering tubes
Chemical requirements of Grade 4130, equals to 30CrMo in Chinese standards :
Carbon, % 0.28-0.33
Manganese, % 0.40-0.60
Phosphorus, max, % 0.040
Sulfur, max, % 0.040
Silicon, % 0.15-0.35
Chromium, % 0.80-1.10
Molybdenum, % 0.15-0.25
Mechanical Properties
Grade Designation | Condition | Ultimate Strength, MPa | Yield Strength, MPa | Elogation in 2 in. or 50 mm, % |
4130 | SR | 855 | 689 | 10 |
A | 552 | 414 | 25 | |
N | 855 | 621 | 20 |
Your accurate descriptions in inquiry will help us give you what you need to make your search successful.
Designation | Symbol | Description |
Cold finished (hard) | BK | Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation. |
Cold finished (soft) | BKW | The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming. (e.g. bending, expanding). |
Cold finished and stress-relieved | BKS | Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
Annealed | GBK | The last cold forming process is followed by annealing in a controlled atmosphere. |
Normalized | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
| Production Standard | Application |
| DIN2391 | Seamless Precision Steel Tubes for mechanical and automotive engineering. |
| EN10305-1 | Seamless Steel Tubes for precision applications |
| DIN17175 | Seamless Tubes of Heat resistant Steels used in Boilers, Pressure vessels & equipment for service upto 600° C and at high pressures. |
| ASTM A179/SA179 | Seamless Cold-Drawn Low-Carbon Steel tubes for Heat-Exchanger and Condenser. |
| ASTM A192/SA192 | Seamless Carbon Steel Boiler Tubes for High-Pressure Service. |
| ASTM A210/SA210 | Seamless Medium-Carbon Steel Tubes for Boiler and Super heater. |
Tests we apply to the tubes:
1) Chemical Composition Analysis
2) Mechanical Properties (Tensile strength, Yield strength,, Elongation, Hardness)
3) Technological Test (Flattening test, Flaring Test, Bending Test, Hydraulic pressure test)
4) Surface quality detection
5) Eddy-current examination
6) Visual test
- Mill test certificates will be issued according to EN10204/3.1B
- Packing: Bare packing/bundle packing/crate packing/wooden protection at the both sides of tubes and suitably protected for sea-worthly delivery or as requested.
- Inspection and Test: Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test, No-destructive Test, Hydrostatic Test.
- Surface treatment: Oiled, black painted, hot dipped galvanized or phosphate coating as required.
- Both ends of each crate will indicate the order no., heat no., dimensions, weight and bundles or as requested.