diff --git a/backend/app/services/integrated_classifier.py b/backend/app/services/integrated_classifier.py
index d3f9559..1d66cc6 100644
--- a/backend/app/services/integrated_classifier.py
+++ b/backend/app/services/integrated_classifier.py
@@ -129,10 +129,31 @@ def classify_material_integrated(description: str, main_nom: str = "",
     # 1단계: Level 1 키워드로 타입 식별
     detected_types = []
     
-    # 특별 우선순위: REDUCING FLANGE 먼저 확인
-    if "REDUCING FLANGE" in desc_upper or "RED FLANGE" in desc_upper:
+    # 특별 우선순위: REDUCING FLANGE 먼저 확인 (강화된 로직)
+    reducing_flange_patterns = [
+        "REDUCING FLANGE", "RED FLANGE", "REDUCER FLANGE", 
+        "REDUCING FLG", "RED FLG", "REDUCER FLG"
+    ]
+    
+    # FLANGE와 REDUCING/RED/REDUCER가 함께 있는 경우도 확인
+    has_flange = any(flange_word in desc_upper for flange_word in ["FLANGE", "FLG"])
+    has_reducing = any(red_word in desc_upper for red_word in ["REDUCING", "RED", "REDUCER"])
+    
+    # 직접 패턴 매칭 또는 FLANGE + REDUCING 조합
+    reducing_flange_detected = False
+    for pattern in reducing_flange_patterns:
+        if pattern in desc_upper:
+            detected_types.append(("FLANGE", "REDUCING FLANGE"))
+            reducing_flange_detected = True
+            break
+    
+    # FLANGE와 REDUCING이 모두 있으면 REDUCING FLANGE로 분류
+    if not reducing_flange_detected and has_flange and has_reducing:
         detected_types.append(("FLANGE", "REDUCING FLANGE"))
-    else:
+        reducing_flange_detected = True
+    
+    # REDUCING FLANGE가 감지되지 않은 경우에만 일반 키워드 검사
+    if not reducing_flange_detected:
         for material_type, keywords in LEVEL1_TYPE_KEYWORDS.items():
             type_found = False
             # 긴 키워드부터 확인 (FLANGE BOLT가 FLANGE보다 먼저 매칭되도록)