Product Category

Industrial 9CrSi plastic shredder blades with HardnessMap QC for efficient PET and PE recycling.

Share to:

9CrSi Plastic Shredder Blades

Payment Terms:
L/C, T/T, Paypal, Money Gram
Min. Order:
10

Availability:

Quantity:



Inquire Add to Basket

Why 9CrSi is the Preferred Choice for Plastic Shredding Blades

Key Specs You Need to Know

Hardness: 58-61 HRC | Core Advantages: High Cost-Efficiency & Long-Life Metallurgy

Why Choose 9CrSi?

In plastic recycling, picking the right blade material is key to saving time and money. 9CrSi is the top choice for small to medium recycling facilities because it performs well and is affordable.

It’s a common low-alloy tool steel
Has high hardness and stays strong after heat treatment
Lasts long without the high price of premium alloys

9CrSi Chemical Composition & Performance Impact

The performance of 9CrSi blades comes from its precise chemical composition (wt%). Each element plays a key role in enhancing the blade’s performance for plastic shredding.

Carbon (C): 0.85~0.95% – Provides the base hardness and wear resistance, forming carbides to keep the blade sharp.
Chromium (Cr): 0.95~1.25% – Improves hardenability, ensuring uniform hardness across the blade and reducing deformation risk.
Silicon (Si): 1.20~1.60% – Enhances resistance to temper softening and high-temperature stability, keeping the blade strong during heavy use.
Manganese (Mn): 0.30~0.60% – Improves toughness, reducing the chance of cracking during heat treatment.
Impurities (P/S): ≤0.030% – Strictly controlled to avoid brittleness, ensuring the blade doesn’t chip easily.

These elements work together to create the 58-61 HRC hardness, long service life, and cost-efficiency that make 9CrSi ideal for plastic shredder blades.

9CrSi Key Benefits

9CrSi’s special metal structure makes it superior to regular carbon steel—it maintains a sharp edge and works well for many plastic types.

Hardness (58-61 HRC): Cuts cleanly without rough edges
Long-Life Metallurgy: Resists wear, so blades last longer
High Cost-Efficiency: Saves money over time vs. cheap or expensive blades
Tough: Doesn’t chip easily during heavy use

Best for These Plastic Types

9CrSi works great for many common recycling jobs, especially these popular uses:

Blades for PET bottle recycling: Grinds bottles into even flakes
PVC pipe shredder blades: Cuts thick PVC pipes easily
Soft plastics (PE/PP films, woven bags): No snagging or sticking
Rigid plastics (ABS electronic housings): Clean, smooth cuts

Other Plastic Types: Recommended Blades

Hard plastics (ABS/PS/rigid PVC): Use SKD-11 alloy steel (super hard and impact-resistant)
Fiber-reinforced/thick/mixed plastics: Use DC-53 alloy steel (resists wear and chipping)