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Mild Steel in CNC Machining

Mild steel is a low-carbon steel that typically contains a relatively small amount of carbon, making it easier to machine, form, weld, and fabricate than higher-carbon steel grades. Its combination of affordability, strength, and versatility makes it one of the most commonly used materials for general-purpose CNC machined parts.

Mild steel provides good machinability and adequate mechanical strength for a wide range of components. It is commonly selected when extreme hardness or high-temperature performance is not required. Its relatively low material cost also makes it an economical option for prototypes, fixtures, brackets, shafts, frames, and industrial components.

Because mild steel has limited inherent corrosion resistance, protective coatings or surface treatments may be required when parts are exposed to moisture, chemicals, or outdoor environments.

Available Mild Steel at Elite Mold Tech:

価格

$$$

リードタイム：

< 10日以内

壁の厚さ：

0.75 mm

公差：

±0.125mm (±0.005″)

最大部品サイズ：

200 x 80 x 100 cm

対象学年：

A36, 1018, 1045

A36 Mild Steel

A36 is a widely used low-carbon structural steel known for its good strength, weldability, and affordability. It is commonly used for brackets, plates, structural components, bases, fixtures, and general-purpose mechanical parts.

引張強度、降伏点（MPa） 250

疲労強度（MPa） 160

破断伸び（%） 20

硬度（ブリネル） 119

密度（g/cm³） 7.85

1018 Mild Steel

1018 is a low-carbon steel with good machinability, weldability, and strength. Its consistent composition makes it a popular choice for CNC machined components, shafts, pins, gears, fixtures, and general mechanical parts.

引張強度、降伏点（MPa） 370

疲労強度（MPa） 220

破断伸び（%） 15

硬度（ブリネル） 126

密度（g/cm³） 7.85

1045 Mild Steel

1045 is a medium-carbon steel that offers higher strength and hardness than typical low-carbon mild steels. It provides good machinability and can be heat treated to improve its mechanical performance for demanding components.

引張強度、降伏点（MPa） 450

疲労強度（MPa） 310

破断伸び（%） 16

硬度（ブリネル） 163

密度（g/cm³） 7.85

Surface Finishing Options for Mild Steel

CNC machined mild steel parts can undergo various surface finishing and protective treatments to improve corrosion resistance, appearance, surface hardness, and service life.

機械加工
ブラックオキサイド
Zinc Plating
ニッケルメッキ
無電解ニッケルめっき
パウダーコーティング
絵画
サンドブラスト
研磨
ブラッシュ仕上げ

Pros and Cons of Mild Steel CNC Machining

Mild steel offers an excellent balance of affordability, machinability, strength, and versatility, making it suitable for many general-purpose CNC applications. However, its relatively low corrosion resistance and moderate hardness can limit its use in certain environments.

Cost-Effective: Mild steel is generally more affordable than many specialized steel and nickel-based alloys.
Good Machinability: Low-carbon grades can be efficiently machined using standard CNC turning and milling processes.
Good Weldability: Its low carbon content makes many mild steel grades easy to weld and fabricate.
Reliable Strength: Mild steel provides sufficient strength for many brackets, fixtures, shafts, housings, and industrial components.
Widely Available: Common grades are readily available in various forms, making material sourcing easier for production.

Limited Corrosion Resistance: Mild steel can rust when exposed to moisture and corrosive environments without suitable protection.
Lower Hardness: It is generally less wear-resistant than hardened alloy steels and tool steels.
Heavier Than Aluminum: Its higher density can make mild steel unsuitable for applications where weight reduction is important.
Limited High-Temperature Performance: Mild steel is not the best choice for components exposed to extreme temperatures or severe thermal conditions.