Shanghai HengYi Metal Co., Ltd. Your trusted partner for custom heavy steel manufacturing and precision metal fabrication in the chemical and petrochemical industry. We deliver high-quality stainless steel fabrications, flame-cut steel components, and ASME BPVC-compliant pressure vessel construction for petrochemical plants and equipment manufacturers worldwide. Our close-tolerance steel and alloy structures are engineered to the strictest ASME standards, setting the benchmark for premium quality and reliability in the industry.