EN 10305 European standard for seamless cold drawn steel pipe of circular cross section used in hydraulic and pneumatic power systems.

EN 10305液压和气动动力系统中使用的圆形横截面无缝冷拔钢管的欧洲标准。

The allowed pressure rates and temperatures are the responsibility of the customer in accordance with the state of the art and in application of the safety coefficients specified in the application regulations, codes or standards.

根据最新技术和应用法规、规范或标准中规定的安全系数，允许的压力率和温度由客户负责。

Tubes according to this EN 10305 European standard are characterised by having precisely defined tolerances on dimensions and a specified surface roughness.

符合EN 10305欧洲标准的管子的特点是具有精确定义的尺寸公差和指定的表面粗糙度。

EN 10305 seamless precision steel tube shall be manufactured from hot finished seamless tubes by cold drawning. Other suitable methods of cold working are permitted. The tubes shall be delivered in the delivery condition +N which means that after the final cold drawing operation the tubes are normalized in a controlled atmosphere.

EN 10305无缝精密钢管应由冷拔热加工无缝管制成。允许采用其他合适的冷加工方法。管子应在交付条件+N下交付，这意味着在最终冷拔操作后，管子在受控气氛中正火。

NBK means protective heat-treating under the non-oxidation enviroment to get a bright and smooth surface for the tubes.

NBK是指在非氧化环境下进行保护性热处理，以获得光亮光滑的管材表面。

Chemical Composition (%) of EN 10305-1  EN 10305-1的化学成分（%）

Mechanical and technological properties of EN 10305-1  EN 10305-1的机械和技术性能

Condition on delivery of EN 10305-1:  EN 10305-1交付条件：

Note:注：

• The yield point for the annealed (GBK)condition on delivery is at least 50% of the (ultimate) tensile strength. Depending upon the degree of deformation in the drawing operation, the yield point of tubes delivered in the cold-finished/hard (BK)and cold-finished/soft(BKW) conditions, may be increased to a level close to the tensile strength.·
• 交付时退火（GBK）条件的屈服点至少为（极限）抗拉强度的50%。根据拉拔操作中的变形程度，在冷加工/硬（BK）和冷加工/软（BKW）条件下交付的管子的屈服点可能会增加到接近抗拉强度的水平。
• In calculating the yield point, the following values are recommended : cold-finished/hard condition on delivery ≥ 80% of the tensile strength, cold-finished/soft condition on delivery ≥ 70% of the tensile strength.·
• 在计算屈服点时，建议使用以下值：交付时的冷加工/硬条件≥抗拉强度的80%，交付时的冷加工/软条件≥抗拉性能的70%。

Quality grade of EN 10305-1EN 10305-1的质量等级

The tubes are supplied in the following quality grades :管子的质量等级如下：

• precision steel tubes intended primarily for mechanical stressing, without any particular quality requirement and without acceptance test certificate.·
• 主要用于机械应力的精密钢管，没有任何特殊的质量要求，也没有验收测试证书。
• precision steel tubes intended primarily for mechanical stressing, with special quirement and exclusively with acceptance test certificate.·
• 主要用于机械应力的精密钢管，有特殊要求，只有验收测试证书。
• precision steel tubes with special requirement according to section 12.·
• 符合第12节特殊要求的精密钢管。

Theses requirements and corresponding tests must be agreed, with the customer having to specify his requirements at the time of enquiry and on ordering.

这些要求和相应的测试必须达成一致，客户必须在询价和订购时说明他的要求。

Seamless cold drawn precision steel tubes in acc. with EN 10305-1符合EN 10305-1的无缝冷拔精密钢管

Seamless precision tubes are used wherever a high level of measuring accuracy, smooth surfaces and improved resistance values are of the essence. These tubes are available in any desired dimension

无缝精密管用于需要高测量精度、光滑表面和改进电阻值的场合。这些管子有任何所需的尺寸

Seamless precision tubes are used for the following applications无缝精密管用于以下应用

• Heat exchangers·热交换器
• Elevator tubes·电梯管
• Gas bottles
• Pit props
• HPL tubes (with phosphated, alternatively galvanised surface)HPL管（表面磷化或镀锌）
• Hawse pipes锚链管
• Motorbike/bicycle frames摩托车/自行车架
• Rivets铆钉
• Pump pipes泵管
• Textile machine construction纺织机械结构
• Cylindrical pipes, piston pipes, telescopic pipes圆柱形管、活塞管、伸缩管
• Stabiliser pipes稳定器管

Seamless tubes for automotive applications汽车用无缝管

• Transmission shafts·传动轴
•  Fuel injection pipes·燃油喷射管
• Piston pins·活塞销
• Ball cages·球笼
• Steering systems·转向系统
• Tubes for power steering systems·动力转向系统用管
• Tubes for drive shafts·传动轴管

EN 10305-1 E355+SR Seamless Cold Drawn Steel Tubes  EN 10305-1 E355+SR无缝冷拔钢管

Standard EN 10305 covers steel-produced precision tubes. This standard includes delivery conditions for six different parts. Part 1 or as referred to as EN 10305-1 refers to Seamless cold drawn precision tubes. These precision tubes are specifically designated with the letter E, thereby the manufacturing processes adhere to the standard and keep tight tolerances, making them well suited for use as machine parts. This is because a precision steel tube en 10305-1 is identical to the system it is to be attached to.

标准EN 10305涵盖了钢制精密管。本标准包括六个不同零件的交付条件。第1部分或EN 10305-1是指无缝冷拔精密管。这些精密管专门用字母E表示，因此制造过程符合标准并保持严格的公差，使其非常适合用作机器零件。这是因为精密钢管en 10305-1与它所连接的系统相同。

Hence, there is no error, nor is there any wiggle room for a mismatch to occur in the system. Therefore the use of EN 10305-1 material to make a cold-drawn precision tube is a welcome one. In addition to being designated as machine steels, there are many grades with differing yield strengths that could be used in the production of EN 10305-1 equivalent tube.

因此，系统中没有错误，也没有发生不匹配的余地。因此，使用EN 10305-1材料制造冷拔精密管是受欢迎的。除了被指定为机器钢外，还有许多具有不同屈服强度的等级可用于生产EN 10305-1等效管。

Generally, most buyers prefer the use of steels that have minimum yield strength of about 235 N/mm2 or 355 N/mm2. The EN 10305-1 material is often designated with a relevant treatment the tubes have been processed with. For instance, the tube with the designation en 10305-1 E235+N would indicate that the steel is to be delivered in a normalized condition. There are several benefits of using an E355+SR EN 10305-1 Cold drawn seamless precision tube. Not only do they have a tighter level of tolerances, but they have better mechanical properties and hardness. Moreover, the cold drawing improves the surface of the EN 10305-1 E235+C tube as they are smoother.

一般来说，大多数买家更喜欢使用最小屈服强度约为235 N/mm2或355 N/mm2的钢。EN 10305-1材料通常被指定为经过相关处理的管材。例如，标有en 10305-1 E235+N的管子表示钢材将在正火状态下交付。使用E355+SR EN 10305-1冷拔无缝精密管有几个好处。它们不仅具有更严格的公差，而且具有更好的机械性能和硬度。此外，冷拔改善了EN 10305-1 E235+C管的表面，因为它们更光滑。

EN 10305 is characterized by having exactly defined tolerances on dimensions and specified surface roughness. Typical fields of applications are in the furniture, vehicle, and general engineering industries. E235 in the pickled, normalized condition, to be delivered in standard length of 5.8 m.

EN 10305的特点是具有精确定义的尺寸公差和规定的表面粗糙度。典型的应用领域是家具、汽车和一般工程行业。E235在酸洗、正火状态下，以5.8米的标准长度交付。

Welded cold drawn precision steel tubes in acc. with EN 10305-2符合EN 10305-2的焊接冷拔精密钢管

Precision tubes according to EN10305-2 are manufactured in a cold forming process for stretch-reduced or HF-welded hollow sections (shell).

符合EN10305-2的精密管采用冷成型工艺制造，适用于拉伸减小或高频焊接的空心型材（壳体）。

Welded drawn tubes are used primarily in the automotive industry, for instance as prop shafts, rubber/metal parts, drive shafts or cam shafts.

焊接拉制管主要用于汽车工业，例如作为传动轴、橡胶/金属零件、传动轴或凸轮轴。

The application options for welded precision steel tubes according to EN 10305-2 are determined by specific technical characteristics, such as

根据EN 10305-2，焊接精密钢管的应用选项由特定的技术特性决定，例如

• high level of dimensional accuracy for the internal and external diameter·内径和外径的高尺寸精度
• restricted tolerances for wall thickness·壁厚的限制公差
• process-related smooth surfaces·与工艺相关的光滑表面
• good concentricity·同心度良好
• improved resistance values through cold forming·通过冷成型提高电阻值
• freely selectable dimensions·可自由选择的尺寸