1.方管的橫截面是規則的四邊形，就像一個空心的鋼鐵盒子，四個邊的長度可以相同（稱為方管）或不同（稱為矩形管），這種結構讓它兼具兩大優勢：

The cross-section of a square tube is a regular quadrilateral, like a hollow steel box. The lengths of the four sides can be the same (called a square tube) or different (called a rectangular tube), which gives it two major advantages:

承重能力強：相同截面積下，方管的抗彎強度比圓管高 30% 以上，因為方形截面的棱角分布能更均勻地分散壓力。例如，搭建腳手架時，邊長 40 毫米、壁厚 3 毫米的方管，單根可承重 500 公斤，適合作為垂直支撐柱，穩定可靠。

Strong load-bearing capacity: Under the same cross-sectional area, the bending strength of square pipes is more than 30% higher than that of round pipes, because the angular distribution of square sections can more evenly distribute pressure. For example, when building scaffolding, a square tube with a side length of 40 millimeters and a wall thickness of 3 millimeters can support a single weight of 500 kilograms, making it suitable as a vertical support column and stable and reliable.

連接便捷：方管的直角邊便于焊接、螺栓固定或卡扣連接，無需復雜的圓弧加工。在家具制作中，方管的四個平面可以直接與板材貼合，用螺絲固定后形成牢固的框架，比圓管節省 30% 的連接時間。

Convenient connection: The right angled edges of the square tube are easy to weld, bolt, or snap connect, without the need for complex arc machining. In furniture production, the four flat surfaces of square tubes can be directly attached to the board and fixed with screws to form a sturdy frame, saving 30% of connection time compared to round tubes.

2.多樣材質：適配不同場景的 “鋼鐵外衣”

2. Diverse materials: "Steel outerwear" suitable for different scenarios

濟南方管的材質選擇豐富，每種材質都像為特定環境定制的 “防護鎧甲”：

Jinan square tube has a wide selection of materials, each of which is like a customized "protective armor" for a specific environment:

碳鋼方管

Carbon steel square tube

以 Q235B 碳鋼為原料，表面多做鍍鋅處理（熱鍍鋅或電鍍鋅），鋅層厚度 8-275 克 / 平方米，就像給鋼材穿上 “防銹外套”。這種方管性價比高，適合室內干燥環境或普通戶外場景，如建筑中的隔墻龍骨、工廠的設備支架。例如，家庭裝修中常用的邊長 20×40 毫米、壁厚 1.5 毫米的碳鋼方管，搭配木質板材制成書架，既承重又不易生銹。

Using Q235B carbon steel as raw material, the surface is treated with galvanizing (hot-dip galvanizing or electroplating), with a zinc layer thickness of 8-275 grams per square meter, just like putting a "rust proof jacket" on the steel. This type of square tube has a high cost performance ratio and is suitable for indoor dry environments or ordinary outdoor scenes, such as wall studs in buildings and equipment brackets in factories. For example, the commonly used carbon steel square tube with a side length of 20 × 40 millimeters and a wall thickness of 1.5 millimeters in home decoration, combined with wooden boards to make bookshelves, not only bears weight but is also not easy to rust.

不銹鋼方管

Stainless steel square tube

采用 304 或 316 不銹鋼，表面光滑且耐腐蝕，能抵抗濟南空氣中的濕氣和輕微酸雨，適合潮濕環境或對美觀要求高的場所。304 不銹鋼方管常見于商場的扶手、酒店的裝飾框架，316 不銹鋼方管則用于化工車間的耐腐蝕管道，即使長期接觸水汽或腐蝕性液體，也能保持表面光潔，使用壽命可達 20 年以上。

Made of 304 or 316 stainless steel, the surface is smooth and corrosion-resistant, able to resist moisture and slight acid rain in Jinan air, suitable for humid environments or places with high aesthetic requirements. 304 stainless steel square tube is commonly used in handrails in shopping malls and decorative frames in hotels, while 316 stainless steel square tube is used for corrosion-resistant pipelines in chemical workshops. Even if it comes into long-term contact with water vapor or corrosive liquids, it can maintain a smooth surface and have a service life of over 20 years.

鋁合金方管

Aluminum alloy square tube

重量僅為碳鋼的 1/3，表面經陽極氧化處理形成致密氧化膜，輕便耐用且無需額外防銹，適合對承重要求不高但需要靈活移動的場景。濟南的戶外廣告架、展覽展示架常使用鋁合金方管，邊長 30×50 毫米、壁厚 1.2 毫米的規格，既能支撐廣告畫面，又便于運輸和安裝。

The weight is only one-third of carbon steel, and the surface has been anodized to form a dense oxide film. It is lightweight, durable, and does not require additional rust prevention, making it suitable for scenarios that do not require high load-bearing requirements but require flexible movement. Outdoor advertising and exhibition display stands in Jinan often use aluminum alloy square tubes with a side length of 30 × 50 millimeters and a wall thickness of 1.2 millimeters, which can support advertising images and facilitate transportation and installation.

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