Product Description
Cold drawn seamless steel tubes for mechanical applications
Product description and field of application
MEILONG TUBE produces precision seamless tubes for mechanical applications according to the European norm EN 10305-1 (MEILONG TUBE can supply other steel grades according to different international standards).
The tubes are cold drawn, thereby guaranteeing optimum dimensional tolerances and can be supplied in different final treatment states. Certain grades can be supplied with a limited sulfur content to assure superior machinability.
MEILONG TUBE cold drawn products are used in the field defined by 'Machinery Directive 98/37/EC', which is for mechanical and general engineering purposes. They are excluded from use in specialized work, such as in pressure vessels and structural applications being subject to other EN norms, Community directives or national laws in force in the countries where they are being used.
Order definition
- Product: 'Precision seamless tubes for mechanical applications'
- Manufacturing standard
- Steel grade
- Delivery condition
- Dimensions: OD x ID, OD x WT or ID x WT
- Length
- Quantity
Grades and indicative correspondence to the standards
The tubes can be manufactured in compliance with the grades of the different norms detailed below.
| EN10305-1 | E235 | E355 | E410 | C35E | C45E | 25CrMo4 | 42CrMo4 |
| ASTM A519 | 1010 | 1020 | 1026 | 1035 | 1045 | 1060 | 4130 |
Note: Other steel grades are on request
Chemical compositions
| Grade | C | Si | Mn | P | S | Cr | Mo |
| E235 | ≤0.17 | 0.15-0.35 | 0.40-1.20 | ≤0.025 | ≤0.025 | | |
| E355 | ≤0.20 | 0.15-0.35 | 1.00-1.60 | ≤0.025 | ≤0.025 | | |
| 1026 | 0.22-0.28 | | 0.60-0.90 | ≤0.040 | ≤0.050 | | |
| 1010 | 0.07-0.13 | 0.15-0.40 | 0.30-0.60 | ≤0.035 | ≤0.035 | | |
| 1035 | 0.32-0.39 | 0.15-0.40 | 0.50-0.80 | ≤0.035 | ≤0.035 | ≤0.40 | ≤0.10 |
| 1045 | 0.42-0.55 | 0.15-0.40 | 0.50-0.80 | ≤0.035 | ≤0.035 | ≤0.40 | ≤0.10 |
| 25CrMo4 | 0.22-0.29 | 0.15-0.40 | 0.60-0.90 | ≤0.035 | ≤0.035 | 0.90-1.20 | 0.15-0.30 |
| 30CrMo4 | 0.28-0.33 | 0.15-0.35 | 0.40-0.60 | ≤0.035 | ≤0.035 | 0.80-1.10 | 0.15-0.25 |
| 42CrMo4 | 0.38-0.45 | 0.15-0.40 | 0.60-0.90 | ≤0.035 | ≤0.035 | 0.90-1.20 | 0.15-0.30 |
Delivery conditions
| Symbol | Description | Previous symbol |
| C | Cold drawn / hard | BK |
| LC | Cold drawn / soft | BKW |
| SR | Cold drawn / stress relieved | BKS |
| A | Annealed | GBK |
| N | Normalized | NBK |
| QT | Quench / tempered | QY |
Dimensions and tolerances
The standard dimensions and dimensional tolerances satisfy the requirements of the standard
EN10305-1.
Tolerances different to European standard can be agreed upon request.
Straightness
A straightness better or equal to 1,0‰ is guaranteed.
Lengths
The tubes are produced in lengths ranging from 3 to 8 m. The average production length varies with the dimensions. For each individual dimension the length varies within a range of 2m.
Lengths different from standard can be agreed at the time of ordering.
MEILONG TUBE can supply tubes cut in fixed lengths with tolerances of -0 + 5 mm.
Controls
The tubes undergo the following tests:
- Mechanical tests in accordance with reference standards
- Electromagnetic test on each tube
- Visual and dimensional check of each tube
Surfaces and protection
The product surfaces are cold finished, as required by EN 10305-1.
The tubes are protected internally and externally with oil, which provides temporary protection against oxidization when undercover.
Tube ends
The tubes come with square cut and deburred ends.
Certification
The product is supplied with 3.1. inspection certificate, according to the standards EN 10204 and ISO 10474.
MEILONG TUBE employs complete product traceability, with the cast number being indicated on each tube.
Identification and marking
The tubes are marked in indelible ink, the details being repeated along the entire length of each tube and on a label, as follows:
Manufacturer's trademark - manufacturing standard - dimensions - steel grade - supply condition - cast no. - item number.
Packaging
The tubes come in strapped bundles.
The minimum weight of each bundle is 2000kg; the maximum bundle weight being 5000kg, with a minimum of 4 pieces.
Minimum lot and quantity tolerances
The minimum quantity supplied varies on the basis of the dimensions, the steel and the additional requirements (options) and is agreed upon the time of ordering.
Quantity tolerance: +/- 5% per item