---
title: Hot-Rolled Hot-Dip Galvanized Steel Strip
desc: Has good mechanical processing performance and corrosion resistance, suitable for construction, granaries and other covering parts and structural parts that require formability and corrosion resistance.
models: 
  - GB/T2518, EN10346: DD(X)51D+Z, DD(X)52D+Z, S220GD+Z, S250GD+Z, S280GD+Z, S320GD+Z, S350GD+Z
  - JIS G 3302: SGHC, SGH340, SGH400, SGH440, SGH490
place: Jiaxiang Kelunpu Heavy Industry Co., Ltd.
publishedTime: 2025-10-21
images: 
  - http://kelunpuzhonggong.com/upload/20251021161717.jpg
detail: 
spec: 
  - 'Thickness: 1.8~4.0mm'
  - 'Width: 1000~1540mm'
  - 'Equal-Thickness Coating: Z60-Z275'
packaging: Regular spangle
slug: '4'
---

## Mechanical Properties
| Purpose | Grade | Yields strength/Re/MPa | Tensile strength/Rm/MPa | Elongation/A80/% |
| :--- | :--- | :--- | :--- | :--- |
| **Commercial** | DDQ(X)51D·Z | — | 270-500 | ≥22 |
| **Drawing** | DDQ(X)52D·Z | 140-300 | 270-420 | ≥26 |
| **Structure** | S220GD·Z | ≥220 | ≥300 | ≥20 |
| **Structure** | S250GD·Z | ≥250 | ≥330 | ≥19 |
| **Structure** | S280GD·Z | ≥280 | ≥360 | ≥18 |
| **Structure** | S320GD·Z | ≥320 | ≥390 | ≥17 |
| **Structure** | S350GD·Z | ≥350 | ≥420 | ≥16 |
---
> When there is no obvious yield, use Rp0.2; otherwise, use Rel for low carbon steel and ReH for structural steel.

## Usage
| Purpose | Grade | Yields strength/Re/MPa | Tensile strength/Rm/MPa | Elongation/A80/% | 180° bending test (transverse) ≤3.0mm | 180° bending test (transverse) ≥3.0mm |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| **Commercial** | DDQ(X)51D·Z | — | 270-500 | ≥22 | 1a | 2a |
| **Drawing** | DDQ(X)52D·Z | 140-300 | 270-420 | ≥26 | 1a | 2a |
| **Structure** | S220GD·Z | ≥220 | ≥300 | ≥20 | 2a | 3a |
| **Structure** | S250GD·Z | ≥250 | ≥330 | ≥19 | 3a | 3a |
| **Structure** | S280GD·Z | ≥280 | ≥360 | ≥18 | — | — |
| **Structure** | S320GD·Z | ≥320 | ≥390 | ≥17 | — | — |
| **Structure** | S350GD·Z | ≥350 | ≥420 | ≥16 | 1a | 2a |

> When there is no obvious yield, use Rp0.2; otherwise, use Rel for low carbon steel and ReH for structural steel.

> Surface treatment: Oiling, passivation, oiling + passivation
