Key Takeaways
Q195 (yield ≥195 MPa, tensile 315-430 MPa per GB/T 700) is a low-carbon steel often used as the substrate for galvanized sheet, e.g. the DX51D family.
Typical uses: non-load-bearing guardrails, brackets, greenhouse frames, fences, appliance parts and packaging.
Process selection: electrogalvanizing for indoor/short-term outdoor; hot-dip galvanizing (typical ≥50 μm) for long-term outdoor.
Load limit: avoid load-bearing structures; upgrade to Q235 for heavy loads.
1. Construction and Decoration
Simple indoor and outdoor protective facilities: non-load-bearing protective structures such as balcony guardrails, stair handrails and courtyard fences; frames or enclosure materials for temporary buildings (site sheds, mobile cabins). Decorative components: indoor ceiling keels, decorative lines, light shelves (supermarket and storage shelves); furniture accessories such as wardrobe hanging rods and shoe rack brackets.
2. Home Appliances and Light Industry
Home appliance parts: internal brackets, bases and fixing plates of refrigerators, air conditioners and washing machines; exposed structural parts such as electric-fan grilles and microwave tray brackets. Daily hardware: hangers, hooks, curtain rods, kitchen racks. Office supplies: stationery clips and metal parts of folders.
3. Agriculture and Animal Husbandry
Farm tools and facilities: greenhouse frames, greenhouse brackets, simple granary frames; metal parts of manual farm tools (hoe handles, sickle bars). Livestock fences: pasture fences, livestock and poultry pens, feed trough brackets.
4. Packaging and Temporary Places
Packaging materials: steel straps for heavy-equipment packaging, wooden-box reinforcements (strapping buckles), lightweight support structures inside containers. Temporary projects and exhibition construction: exhibition booth frames, temporary shelves for promotional activities, temporary signs at construction sites, and scaffolding crossbars in non-load-bearing temporary use only (scaffolding crossbars are normally load-bearing components; use in this application is limited to temporary, non-structural setups).
5. Core Selection Logic
Environmental adaptability: preferentially used in dry, low-corrosion environments; avoid long-term exposure to high salt spray, acid, alkali or humid scenes. Process selection: electrogalvanizing for indoor or short-term outdoor use (low cost); hot-dip galvanizing for long-term outdoor use (typical coating ≥50 μm); composite protection is required for high-corrosion environments. Load limit: avoid use in load-bearing structures; if heavy objects need to be carried, upgrade to higher-strength galvanized steel such as Q235. Confirm the substrate grade and coating class (e.g. Z-series coating mass per the applicable standard) with the supplier.
Frequently Asked Questions
Q1. What is Q195?
A low-carbon structural steel per GB/T 700 with yield ≥195 MPa; common galvanized-sheet substrate (DX51D family).
Q2. Can Q195 galvanized steel be load-bearing?
No - use it for non-load-bearing parts; upgrade to Q235 for loads.
Q3. Electrogalvanizing or hot-dip?
Electro for indoor/short-term; hot-dip (≥50 μm typical) for long-term outdoor.
Q4. Where is it most used?
Guardrails, brackets, greenhouse frames, fences, appliance parts and packaging.